Pink screen during log in

I just had an upgrade to my operating system that came to me from the App Store.  After downloading it, my imac 27 now has a pink screen come up while signing in.  It only is a flash of pink and last a sec or less.  However it isn't something that has happened in the past, and I wonder if others have seen this or had it happen to them?

Some  of the display settings are stored in PRAM.
Reset PRAM:   http://support.apple.com/kb/PH14222
Best.

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