Yosemite has left me with a white screen.  2011 model

I haven't managed to get passed a white screen since installation.  Is there a fix for this? I'm worried.  Running on imac Intel 2011 model

hi,
i had the same Problem minutes ago. I solved it by klicking the middle of the screen where usually the login picture appears. I then typed in my password and pressed enter. Maybe it was just the "klicking around in the Middle of the screen", wich helped. Anyway, it worked! and im now able to finish my installation.
hope that helped,
MIchael

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