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Technology in terms you understand. Sign up for the Confident Computing newsletter for weekly solutions to make your life easier. Click here and get The Ask Leo! Become a Patron of Ask Leo! A suddenly black screen accompanied by what appears to be a completely unresponsive computer is, most often, a symptom that you computer has crashed. And the most common cause of crashes is overheating.

Your computer needs good ventilation to avoid overheating. Occasionally, a poorly-designed computer can overheat even if there are no obstructions. Most often this is because the CPU is being used too heavily for too long. If the latter is the case, you may need to take steps to provide extra ventilation, or cool the air flowing around or through your computer.

One of the early signs of impending failure is a periodic crash such as you describe. In addition, drivers related to the hardware can also come in to play. Load up a longish mp3 play list or streaming audio station and let it play. Download right-click, Save-As Duration: — 5. I had this same issue with my old computer that was running Win 98 SE.

I went through and systematically started to replace everything in there. By the time I was done, I only had the CRW drive, motherboard and ram that was original over the computer.

I hope that this helps anyone else. After hitting a key on the keyboard, the screensaver went away and I was able to continue using the system. What can I do to fix it?? I remedied this by disabling the screen saver and disable any hibernation or stand-by. How were you able to do that Peter? No screen appears at all for me to see to do just what you said you did?

why does a black box appear on my computer screen

It is a laptop. Can it be my Mobo or bad drivers?. Also, there is no hibernate option. How will i get it back? Well i keep starting my computer as normal and after about 2minuites it goes to a blue screen and says beggining physical memory dump then it completes and still stays on the blue screen!

why does a black box appear on my computer screen

Please e-mail with the problem, ive downloaded and anti-virus but cant use it because im running in safe mode direct servies restore the only way i can get this darn thing to work atm momemnt.

This only happened a few days back though when my computer turned off then it kept saying your computer is infected with adware n spyware but i cudnt exit the progam?

Please help asap ben. The blue screen sounds like XP and a heat problem with the power supply. I had that happen. Took the computer apart and cleaned everything. I even took the power supply appart and the CPU heatsink and fan assembly. Low and behold the fan on the power supply was struggling to start and kept stopping.

That fan was the cause of the problem. On so far as the virus thing goes. This is regardless of your Windows version. Hope this may help……Alan.If you see black borders on the sides of your computer screen, select the type of monitor you have from the list below for troubleshooting steps. If you're using an LCD monitorfollow these troubleshooting steps. Verify you have the latest video driver installed on your computer.

For links to many video drivers, see our video card drivers index. It is normal for a widescreen LCD to have black borders if you're running a non-widescreen resolution or the program, game, or movie you're watching does not support widescreen.

Make sure to change your resolution settings in Microsoft Windows to a resolution that supports widescreen. Examples of widescreen resolutions are x and x If you upgrade Windows from an older version to a newer version, the display resolution may revert to a default setting.

If you see black borders after upgrading Windows, you should change your resolution settings again. Many DVDs support both widescreen and fullscreen mode. If you're using a widescreen LCD, make sure to display the movie in widescreen format. Additionally, you can change the aspect ratio in many DVD programs to fit your display. Due to architectural differences from the standard CRT monitor, an LCD has a set resolution often referred to as native resolution.

For example, if an LCD had a set resolution of xbut a user changed it to something larger, the size of displayed images will decrease, causing a black border to appear. To rectify this issue, most LCD or laptop manufacturers have a utility that can "stretch" the pixel size, allowing smaller images to take up the fullscreen. This action will, however, decrease the quality of the image slightly especially noticeable when viewing text.

Because the method used to enable this feature varies, we recommend you contact your laptop or LCD manufacturer for additional information. A listing of links to video drivers is on our video drivers page. If the resolution was recently changed, the monitor may not auto adjust or shift to the correct size.

If this occurs, the resolution can be changed back to the original setting or you can manually adjust the monitor as instructed below.

If a black border exists on the monitor, it can be resolved by manually adjusting the horizontal or vertical width. Because each monitor is different, the method of adjusting this setting vary. Consult your monitor documentation. Additional information about these controls, as well as example pictures of the settings, is on our monitor help page. Older monitors may not have the feature to adjust the horizontal setting.

If this is the case, refer to the notes below.Jump to content. You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

Posted 13 June - PM. A black box appears then disappears then reappears then disappears I am worried it may be a virus of some sort. Posted 14 June - AM. Download and install Malwarebytes and get it up to date. Boot to Safe Mode and run it, then do a full system scan with your antivirus. Community Forum Software by IP. What do I do? Javascript Disabled Detected You currently have javascript disabled. Register a free account to unlock additional features at BleepingComputer.

Welcome to BleepingComputera free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.

Click here to Register a free account now! Black box appears and disappears on my screen. Started by EnglishguyJun 13 PM. Please log in to reply.Press the CapsLock or NumLock key and check whether the status light for the key turns on. After 30 seconds, plug your adapter back in and restart your device. There might be a connection problem with your PC or with your monitor or screen. Here are some things to try. Your device won't be unprotected because Windows Defender Antivirus kicks in if no other antivirus software is running.

Get more info about Windows Security.

why does a black box appear on my computer screen

This includes basic system processes, antivirus software, system utility applications, and other installed software. If you got to the sign-in screen but then your screen went black or blank, try the following actions in order. If Windows is responsive, a short beep will sound and the screen will blink or dim while Windows attempts to refresh the screen.

If there's content or a cursor on the black or blank screen, try to restart the Windows Explorer process.

Troubleshoot black screen or blank screen errors

Type explorer. The display adapter is also known as the graphics card. Driver updates for Windows 10 and many devices such as network adapters, monitors, printers, and graphic cards are automatically installed when you update Windows Restore points are created when you install a new app, driver, or update—or when you create a system restore point manually. If you restarted your device and now you see dots moving in a small circle on a screen that's black or another color, don't worry.

However, if these dots remain on the screen for too long after an update, you may have incompatible or mismatched graphics cards or drivers. Try the following actions in order.

Press and release the power button again to turn it back on. This site uses cookies for analytics, personalized content and ads. By continuing to browse this site, you agree to this use. Learn more. Select Product Version.

All Products. Before signing in to Windows 10 I see a black or blank screen. After signing in to Windows 10 I see a black or blank screen. After restarting my device I see spinning dots on a screen that's black or another color.

Action 2: Check your connections There might be a connection problem with your PC or with your monitor or screen. Unplug the video cable from both your monitor and PC, then reconnect them firmly. After you reconnect the video cable, move your mouse to see if the cursor moves on your screen. This option may not be available for all PCs.

Try connecting to different video outputs on your PC. If you have your own display adapter installed and connected to your monitor, try connecting your monitor to the built-in video on the motherboard.

Make sure the lid of your laptop is completely open after undocking.Hi everyone. I have been experiencing a black box which flashes onto the screen of my laptop about every10 minutes or so. It looks like an error message box - but there is no text - plus it flashes so quickly I don't know the source.

When I was checking the HP Support Assistant for updates, before downloading there was a box which asked to randomly send data to HP which I ticked yes for. The black box is driving me insane as I use my laptop for work so when typing and the box flashes letters get missed out.

A black screen may appear while logon by using remote desktop

Plus when watching BBC iPlayer today the box kept flashing up and missed some of the programme. I did try a system restore last night and it is still the same. I am hoping someone can help. I am based in the UK so a phonecall to US may be a little costly. Also, I struggle with talking on phone due to my disability.

Fix: Desktop icons black squares windows 10

Asking the question on the forum was the recommended contact by HP. Go to Solution. Don't worry as I'll be glad to help, however, to provide an accurate resolution, I need a few more details:.

SFC, known as System File Checker, can be used as a tool to scan all of important Windows files on your computer and repair them if necessary. Thank you for your advice. It did the trick!! I had not installed any recent programs and I had already tried a system restore. The only thing recently changed was the update to BIOS. I am just glad to be able to do some work now without the annoying black box. I'm glad I could contribute towards identifying and leading you towards the solution for this concern.

To simply say thanks for my efforts to assist you, please click the "Thumbs Up" button to give me a Kudos. Take care now and do have a fabulous week ahead.

Flashing command box keeps appearing on my screen every few minutes and it is really annoying. I have tried to follow the steps that you have previously recommended but neither are helping. Is there anything else i can do? I tried both fixes you suggested. I have tried both of the solutions you suggested but the issue was not resolved for my laptop. Could you please share the next steps? Windows Resource Protection found corrupt files but was unable to fix some of them.When Harrison Bywater turns on his PC, the power lights and the fan turn on, but no image appears on the screen.

I'll start with the bad news: There's a very good chance that you'll have to take the PC into the shop. The good news: With a few simple tests, you might be able to avoid that expensive trip. Or, at the very least, you'll be able to come into the shop with enough knowledge to avoid being played a fool.

Send your query to answer pcworld. I'm assuming here that absolutely nothing comes up on the screen. You don't see the Windows logo. You don't see the manufacturer's logo. You don't see a blinking cursor. But what kind of screen are we talking about? I'll give you instructions for both an external screen and the one built into your laptop or all-in-one. As is so often the case, diagnosing and repairing hardware is much easier when all of the parts aren't enclosed in the same, tiny box.

Does it turn on or change color the way it did before the problem started? If no light comes on at all, make sure the power switch is on and the monitor is plugged into an electric outlet. If it is, try another outlet. Once you're sure it's getting power, check the cable connecting the monitor to the computer.

Make sure you have solid connections on both ends. Still no fix? Then it's time to swap monitors. This is easy if you have another monitor handy.

Annoying Black Box

Otherwise, bring your monitor to a friend's home and try it with their computer. You have far fewer options with a laptop or all-in-one. For instance, if the problem were a loose cable connection, you'd have to open the PC, find the right cable within a very tight space, and figure out where it goes. I generally don't recommend that readers try their own internal laptop hardware repairs. If you don't know what you're doing, you can easily brick the machine. So what should you do? First, turn up the brightness.

Study the keyboard for an icon that suggests turning up the light for instance, the sun and an up arrow. Hold down the Fn key while you hold down whatever key has that icon. You should also try using an external monitors. If this works, you at least know the problem is with the built-in screen. At this point, I think you're going to have to take the laptop to a professional. But if you decide to ignore my advice and try to repair the screen yourself, read Eric Geier's instructions first.

In addition to technology, freelance journalist and sometimes humorist Lincoln Spector is a passionate cinephile who writes the Bayflicks. Whatever it is, it's a hardware problem. Windows is not to blame. Nor is your hard drive. External monitor As is so often the case, diagnosing and repairing hardware is much easier when all of the parts aren't enclosed in the same, tiny box. If that doesn't solve the problem, try another cable.Dead pixels can be extremely distracting when you are trying to use a computer, appearing as black spots on your screen.

Each individual pixel on an LCD screen is made up of three diodes -- one red, one blue and one green. If all three fail, the pixel will appear as a permanent black dot. In some circumstances, you can bring a dead pixel back to life by using a recovery application on your monitor.

Recovery applications force the pixels on your monitor to change rapidly, potentially re-awakening the faulty diodes.

Alternatively, massaging a dead pixel with a soft object can sometimes fix the issue. Leave this pattern running on your screen for 10 to15 minutes. Check to see whether or not the dead pixel is now working again. Click and drag the window over the dead pixel and then let the program run for around 10 minutes.

Add a small piece of adhesive tape to the edge of your monitor directly above the location of your dead pixel. Next, add another small piece of tape to the edge of your monitor directly to one side of the pixel.

why does a black box appear on my computer screen

These pieces of tape will act as co-ordinates to help you locate the dead pixel with your monitor turned off. Push the eraser end of the pencil against the stuck pixel for around 10 seconds and then release. Repeat this motion 15 to 20 times. Use a smooth, gentle motion when pressing the pencil against your display in order to minimize the risk of further screen damage. Dead pixels can be a symptom of transistor failure inside your screen's display panel. If one or more transistors have failed, you will need to take your display to a repair shop to fix the problem.

Andy Walton has been a technology writer sincespecializing in networking and mobile communications. He was previously an IT technician and product manager. Walton is based in Leicester, England, and holds a bachelor's degree in information systems from the University of Leeds. The database based on Word Net is a lexical database for the English Language. See disclaimer. Using Physical Pressure Step 1 Add a small piece of adhesive tape to the edge of your monitor directly above the location of your dead pixel.

Remove the tape and then turn the monitor on. Check to see if the dead pixel is working again. About the Author. Photo Credits.