At start up only white screen, At start up only white screen

Hello,
Yesterday my iMac would not boot up passed the dong and the white screen. How do I get passed this?

Try starting up the mac in verbose mode (command-v during startup)
This will show you everything the mac is doing during startup, and possibly show you where the mac is getting stuck
Also try an SMC reset (http://support.apple.com/kb/HT3964) and see if that helps
Another avenue to try is to hold option during boot and see if your mac can find any drives at all.
If you have one, try booting into your original disks that came with the computer, or a lion key. That will at least show you that the computer is able to boot
Failing all of that, your mac may need a hardware repair

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    What  iMac is it and what version of OS X are you running?
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    Hi-
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    Hard drive maintenance with Disk Warrior is the best way to correct corrupt files, unless bad RAM is corrupting the files.....
    In your case, it shouldn't hurt anything to remove the Radeon 8500 drivers.
    Could it be the driver extensions that are preventing a proper boot. The monitor displays perfectly in safe mode so I don't understand why it would be the video card.
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  • My computer has a white screen at start up and sits for hours. How can I fix my computer?

    My computer has a white screen at start up and sits for hours. How can I fix my computer?

    Take each of these steps that you haven't already tried. Stop when the problem is resolved.
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    When you start up 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, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 10. If you ever have another problem with the drive, replace it immediately.
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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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    My MacBook pro retina display 15 inch (2013) doesn't start. After I press the start button there is only a beep sound at regular interval. The screen remains blank and the keys don,t light up. Can anyone help please?

    If your MBP is under warranty, bring it to an Apple store and have the technicians fix it.  If not, try the steps in this support article:
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    Hi-
    Jean Baptiste mentioned that he removed extensions for the drivers.
    Removing a conflicting driver is fine as long as the driver specific for the card installed remains.
    In this case, I think it may have been a corrupt driver, rather than a conflicting driver.
    Radeon drivers in OS X have a good track record of compatibility, and such driver conflict is not a historically common occurrence.
    Hard drive maintenance with Disk Warrior is the best way to correct corrupt files, unless bad RAM is corrupting the files.....
    In your case, it shouldn't hurt anything to remove the Radeon 8500 drivers.
    Could it be the driver extensions that are preventing a proper boot. The monitor displays perfectly in safe mode so I don't understand why it would be the video card.
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    No Quartz/Quartz Extreme, no Core Image, no 3D acceleration, etc.
    This doesn't tax a graphics card.
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    Installing a different graphics card is the only way to rule out the second.
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    Installing a new OS on a separate drive, and booting to that is an easy way to test.

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    Try reset
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    Festus,
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