Computer screen is all black

Tried to adjust contrast on my computer now it is all black with the exception of a few icons. The icon to do this I found on the lower right corner of the screen now to make the adjustment has disappeared so am unable to reverse. My aim was to improve the strain on my vision.

Hello @Allie77 ,
Welcome to the HP Forums!
I understand the screen is mostly black after making changes. I'll do my best to help, but first, please provide the following information:
1. The computer's model number. If you require assistance locating this information, please reference this website: Guide to finding your notebook product number
2. The computer's operating system. If you require assistance locating this information, please reference this website to determine your Windows operating system.
3. Does this occur on certain programs, or all programs?
4. Have you installed any new software or drivers on this computer, before the issue appeared?
Additionally, if the issue just began occurring, I would perform a system restore. I want you to bring the computer back to the earliest restore point possible, in an attempt to dodge whatever caused the issue. Here is a document on how to perform a System Restore: System Restore
Mario
I worked on behalf of HP.

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I just tried to install the new IOS version and now my screen is all black.. since an hour. My power button is broken so i cant reset my phone. When i plugg it in my computer, it makes a sound, but the screen stays black.
WHAT TO DO

carter87 wrote:
so i bought this Iphone 4 thats jail broken,
Return it.
Unauthorized modification of iOS can cause security vulnerabilities, instability, shortened battery life, and other issues
Security vulnerabilities: Jailbreaking your device eliminates security layers designed to protect your personal information and your iOS device. With this security removed from your iOS device, hackers may steal your personal information, damage your device, attack your network, or introduce malware, spyware or viruses.
Inability to apply future software updates: Some unauthorized modifications have caused damage to iOS that is not repairable. This can result in the hacked iPhone, iPad, or iPod touch becoming permanently inoperable when a future Apple-supplied iOS update is installed.
... It is also important to note that unauthorized modification of iOS is a violation of the iOS end-user software license agreement and because of this, Apple may deny service for an iPhone, iPad, or iPod touch that has installed any unauthorized software.

I was trying to update my Ipad to IOS 8, the screen is all black with the apple logo on it and the progress bar is stuck,

I was trying to update my Ipad to IOS 8, the screen is all black with the apple logo on it and the progress bar is stuck.
I can't turn it off, and when i connect it to itunes, it doesn't display

Try putting the iPad in restore mode and see if iTunes recognizes it. The steps are below:
Turn your iPad off.
Hold down the Home button and plug it into your computer. Keep holding the Home button until you see a screen telling you to connect to iTunes.
iTunes should show you a popup saying that there is an iPad that is in Recovery Mode and needs to be restored before you can use it. Click OK.
Click on Restore iPad

When using crop tool the screen goes all black

When I select the crop tool and drag it across the photo to select crop area, the screen goes all black so that I cannot see the area selected or modify its size.
All the boxes (size and resolution) of the tool are clear.
Can somebody help me?
I did try resetting all tools but didn't change anything, I restarted the program, I restarted the computer and is still happening.
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The advice that seems to work most often with this kind of failure is to update your video drivers from the web site of the maker of your video card.
Here are the links to the driver update pages for the two big video card makers:
ATI : http://www.amd.com/us/Pages/AMDHomePage.aspx
nVidia: http://www.nvidia.com/Download/index.aspx?lang=en-us
-Noel

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Try here:
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Try this previous discusssion:
https://discussions.apple.com/message/12518406#12518406

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Back up all data.
Triple-click the line of text below to select it, the copy the selected text to the Clipboard (command-C):
/Library/Internet Plug-ins
In the Finder, select
Go ▹ Go to Folder
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~/Library/Internet Plug-ins
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Welcome to the Apple Community.
This might be a problem with the movies themselves, where are they from, are they your own movies that you have converted yourself.

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The reboot, or reset as you tried, will sometimes bring the screen back but not always. If holding both the power and home buttons does not result in the apple logo appearing in about a minute, the device needs to be taken to the Apple store genius bar to have the technicians test and see if there is a failure in the screen/digitizer.

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The screen is all black

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@oneyrufeofipadthendies,
We believed too warranty was 1 year, but it turned out being 2 years.
But you warranty is country and store specific, it could vary from no warranty to 3 years warranty.
So you could check the store's site to check if warranty is still valid.

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Sleep function OS X Mavericks:
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Hello Alvaro1974
Depending on the issue, one of the articles below should sort you out. The first will more troubleshoot the display and the second article will be about the startup process and the software on you MacBook Pro.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Regards,
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Computer screen is all black

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