Why does my 2011 iMac have a garbled grey screen after booting?

I recently purchased a Mid-2011 27" iMac, and notice that upon each boot, the typical grey Apple screen becomes garbled for a moment, then transitions into my desktop.  So far, nothing seems to be wrong other than the momentary garble (which lasts a few seconds), and all my applications (to include games) run just fine, even after long periods.
This seems like this is mostly an inconvienence.  It should be noted, this only occurred not long after restoring my Snow Leopard install from my 2008 iMac.  I didn't think this would have anything to do with the problem since it didn't arise immediately afterwards.

I have a similar 10.9 startup  glitch as posted here
https://discussions.apple.com/thread/5638255
I could not find any other person complaining about it until I foound this thread.  but I have a mac pro early 2008, and never ever experianced this before 10.9.

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