Screen is all white after display wakes up. Why?

I have a mid 2011 iMac and recently noticed a new issue. After the computer wakes up from sleep, the screen is entirely white. If I click on an area or open an app, the program opens and an are around the window restores part of the background. This has been happening for maybe a month or so. Any ideas why?

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
*Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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My MacBookPro (mid 2012) will not complete the boot process. Yosemite's progress widget gets about 1/3 to 1/2 way across when the logo disappears and the screen goes all white for 10-15 secs or so, then the machine shuts down and restarts.

My MacBookPro (mid 2012) will not complete the boot process. Yosemite's progress widget gets about 1/3 to 1/2 way across when the logo disappears and the screen goes all white for 10-15 secs, then the machine shuts down and restarts. This sequence will repeat seemingly forever unless I shut it down manually.
I upgraded to Yosemite from Mountain Lion a couple months ago, skipping Maverick completely, and I've done any associated updates that Apple told me about. I don't recall which version of Yosemite I have, but I'm sure it is the "latest and greatest".
I've tried re-starting in Safe Mode / Safe Boot and that does the same thing as described above except without the endless restarts. Instead of restarting at some point, SafeBoot proceeds to the white screen and then it hangs until I restart it manually. (I've waited as long os 20-30 minutes with no response).
When I tried the option-command-p-r key combo I never get any chimes or other noises besides the original 1 time boot sound that you would expect to get when starting up a macbook pro.
I was using the mac quite normally (meaning I was doing work I normally do on it and there was no indication of anything wrong) immediately prior to this happening.
The machine is BootCamp(ed) with Windows 8.1 which I use from a VMWare virtual machine instead of natively so that I can have both OSes running at the same time. I also think this is unrelated to my problem. I have been using this setup for more than 2 years.
My upgrade to Yosemite was uneventful and I thought it went well and was very smooth. I don't want to lead attention away from Yosemite, but at this point my problem does not seem related to the upgrade.
Any help is appreciated.

Install or Reinstall OS X from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
      the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
           because it is three times faster than wireless.

My screen got totally white after updating to Yosemite

Uploaded the Yosemite to my IMac.
When installing the new update (running OS10.6.8 before) the computer restarted during installation.of program.
After that the screen is just totally white. What happened and what shall I do?

Thank you.
I’m writing from a PC at the moment.
Thanks for the answer. I can’t save anything now, the computer is ‘dead’ it is a shame on all I have on the computer.
And all this problems because of my banc who wanted my to update in order to put in a special identification program.
Who shall I blame?
I have to rebote my computer.
I am crying… ☹
Harriet
Från: Apple Support Communities Updates [email protected]
Skickat: den 17 februari 2015 22:44
Till: Aqua Produkter
Ämne: - My screen got totally white after updating to Yosemite
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You received a reply
Kappy<https://discussions.apple.com/people/Kappy?ac_cid=op123456> has replied to your question. You can view the full discussion<https://discussions.apple.com/message/27684871?ac_cid=op123456#27684871> in Apple Support Communities.
My screen got totally white after updating to Yosemite<https://discussions.apple.com/message/27684871?ac_cid=op123456#27684871>
Can you reboot the computer to Snow Leopard? If so, then re-run the Yosemite installer application. It should be in your Applications folder.
If you can't, then you need to erase the drive and reinstall Snow Leopard:
Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it.
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer. Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the "C" key. Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. After the installer loads select your language and click on the Continue
         button. When the menu bar appears select Disk Utility from the Utilities menu.
         After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
         size.) Click on the Partition tab in the DU main window. Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
         and select GUID, click on OK, then set the format type to MacOS Extended
         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer. Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. After you finish Setup Assistant will complete the installation after which
         you will be running a fresh install of OS X. You can now begin the update process
         by opening Software Update and installing all recommended updates to bring your
         installation current.
Download and install Mac OS X 10.6.8 Update Combo v1.1<http://support.apple.com/kb/index?page=answerlink&url=http%3A%2F%2Fsupport.apple .com%2Fkb%2FDL1399&answerid=16777216&src=support_site.downloads.search>.
Correct Answer <https://discussions.apple.com/email/thread/6836494/correct/27684871> Helpful Answer <https://discussions.apple.com/email/thread/6836494/helpful/27684871>
Use the buttons above to tell Kappy and the rest of the community if this reply solved your question or helped you get closer to finding a solution.
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Hello grasyapagsinta
Welcome to BlackBerry Support Community Forums
If you think your Battery it OK then try Updating or reloading your device software to rule out any software issue.Have a look at on how to perform a clean reload of device software :
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Click " Like " if you want to Thank someone.
If Problem Resolves mark the post(s) as " Solution ", so that other can make use of it.
Click " Like " if you want to Thank someone.
If Problem Resolves mark the post(s) as " Solution ", so that other can make use of it.

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TThanks for the suggestion but it turns out that you have to hold down the Home button, the Power button AND the Volume UP button at the same time for several seconds until,the Apple appears To fix the white screen of death. Found that on another help site. It works and boy an I glad. Pass it on.

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Screen has turned white after I turned the laptop on?

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Screen is all white after display wakes up. Why?

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