Display to dark

my imac shows colors to dark. at the start of the osx colors are normal for about 1 second and then it gets too dark. when I start the program XMBC and then close the colors are normal! that is, it is not a hardware defect. Display (colors) calibrate PRAM reset, complete reinstallation (also with hard drives formatting) everything was unsuccessful. the problem was from the beginning and software spread of mountain lion to yosemite there. I have an iMac mid 2010 .. many thanks for your help

What happens with a Safe Boot? OS X: What is Safe Boot, Safe Mode? - Apple Support

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    Mac doesn't boot
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    Black screen: This is usually a sign of a failed logic board. There is no single reason for this and this may be caused by failed GPU, screen, CPU or RAM.
    Circle of death/no circle/blue screen: This is usually a sign of a hard drive failure. This may NOT be a dead hard drive, just broken permissions or something
    Gray screen/Apple logo/spinning gear or globe/prohibitory sign/folder with flashing question mark [3]: This could be a sign of faulty hardware but more likely a software issue, i.e. broken permissions, failed software update, etc.
    [edit]
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    First, hold down the option key (also known as the alt key) just after you've pressed the power button. This should show all the available options to boot from, so if you have Windows installed through Bootcamp or a disk in your SuperDrive, you should be able to see them along with your OS X drive/partition. Select the OS X partition with arrow keys and press enter. Startup key combinations
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    7. "Repair" OS X. Boot from the install disk as in point 5. and reinstall OS X. This should NOT erase any data, just replaces the system files which may have caused your booting problem. Now install the latest combo update for OS X and repair permissions on your drive with Disk Utility.
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  • Display turns "dark" after 1 minute

    Hi, first of all forgive my english
    I have a an unpleasent problem with my display, it turns dark after 1 minute of no using it. 
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    Please join the following thread. When you do, give your complete model number.
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    Apple retail store) up to this morning. When I got up
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    Edit

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    You should probably have it looked by Apple Tech Support.  If there's an Apple Store nearby, you can take it to the store's Genius Bar.  To avoid waiting, you can make a reservation at the store's web page
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  • MSI GX710 display too dark - defective cable?

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