My imac stuck on white screen on startup

hi i got a late 2009 27" imac with i7, recently i restart the imac, it just keep stuck on the white screen right after i hit the power, no apple logo no chime, just blank white screen. i unplug the power cord for 1 hour and plug back in still the same.

Start your computer with the original DVD that came with system and repair your disk with disk utility, also repair permissions.  http://support.apple.com/kb/TS1417

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    How come my imac is stuck on white screen?

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  • IMac Stuck on White Screen with Apple Logo

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    If you sign into the App Store and try to purchase Mountain Lion but the App Store says your computer is not compatible then you may still be able to upgrade to Lion per the following information.
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    To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
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             See App Compatibility Table — RoaringApps.
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  • Stuck at white screen on startup

    I managed to kick the plug from the wall and kill power to my computer.
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  • IMac Freezes at white screen during startup

    Hello,
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    You could try to use SafeBoot mode on startup, essentially you'd hold the Shift
    key down on startup, perhaps you may need to login after waiting quite awhile,
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    edited

  • Stuck on white screen at startup.

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    We also have about 40,000 pics in iphoto which Im told is not a problem.
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  • Macbook stuck at white screen on startup

    Whenever I on my MacBook it gives off this white screen as seen in the pic. I tried command+r and holding down the option key on startup but it still leads me to this white screen. Help please and thanks on advance.

    Mac OS X: Gray screen appears during startup - Apple Support
    Intel-based Mac: Startup sequence and error codes, symbols - Apple Support
    I think you'd better off making Genius Bar appointment and show them your problem.

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