I get a white screen when I turn on my computer

I get a white screen whenever I turn on my computer. What can I do?

Hi Dtrain10591,
Welcome to the Support Communities!
The article below may be able to help you with this issue.
Click on the link to see more details and screenshots. 
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Cheers,
- Judy

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    Take each of these steps that you haven't already tried. Stop when the problem is resolved.
    Step 1
    The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.   
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    b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
    c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
    Step 2
    Sometimes a boot failure can be resolved by resetting the NVRAM.
    Step 3
    If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
    Step 4
    Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
    If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
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    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.
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    When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 6.
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    If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
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    http://support.apple.com/kb/TS2570 Mac OS X: Gray screen appears during startup
    ===============
    When posting in Apple Communties/Forums/Message Boards.......It would help us to know which Mac model you have, which OS & version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by completing your system profile and filling in the information asked for.
    CLICKY CLICK---> https://discussions.apple.com/docs/DOC-3602
    CLICKY CLICK-----> Help us to help you on these forums

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    Message was edited by: kostby

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