Why am I getting a white screen after downloading to OSX Mountain lion from OSX Snow Leopard. What caused this?

I just upgraded to OSX Mountain Lion from OSX Snow Leopard, thinking this was the thing to do.  I have NEVER had any problems with Snow Leopard, but
after just a few days after downloading OSX Mountain Lion when I turned the computer on, the screen was white.  Stayed white.  I had to go onto another
computer to find out what to do.  What caused this and will this happen again?

Did you see a circle made of light grey hash marks in the center/bottom of the screen?  My iMac is 5 years old and for every update until 10.8.2 I would get the same white screen and the first few times I paniced and thought the machine was broken!  Just let it play out until the desktop comes back up and it should not do it again until you do a system update. 

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    Hey guys...
    Just posted this potential solution over in the forum Clinton mentioned. Not sure if it's a proper fix, but it seemed to work for me.
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    No idea why this works. Don't have any clue what PRAM even is or what it would have to do with all this - but it worked for me. At least this time. Maybe it won't the next!
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    http://support.apple.com/kb/HT1379?viewlocale=en_US&locale=en_US

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    After downloading OS X Mountain Lion, my mac has become very slow and takes a bit to shut down programmes. What can i do to bring it back up to the speed it was when i had OS X Lion

    LouieAustin wrote:
    After downloading OS X Mountain Lion, my mac has become very slow and takes a bit to shut down programmes. What can i do to bring it back up to the speed it was when i had OS X Lion
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  • Why I'm still getting a white screen after Replacing the screen on my iPhone

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  • Why do i get a white screen in itunes 11 on my iMac?

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  • I'm getting a white screen after deleting languages

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