Mac black screen issues after OS installation

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I have an iMac 27” which was on Mavericks and then I installed Mountain Lion OS. Now the iMac gives a black screen yet the screen is powered. Whenever I click on sleep or if the PC goes on sleep mode by itself, it just fails to power up again. When I forcefully press the power button it then sounds like it is working well, but the screen is not showing anything. What could be the problem? Graphics card or Display?

 
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Answered By 0 points N/A #200306

Mac black screen issues after OS installation

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This might be an issue with display drivers. While installing the operating system, all the system files were not properly copied. To try and solve this issue. RE-install the operating system once again and it should work fine. If that does not work, there might be a problem with the operating system you are trying to install hence you might need to find another copy.

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