Mac book pro garbled screen briefly at startup

I've had a recent change on my 17" MBP. On startup, just before the login, the screen goes gray (not the texture graphic, but a flat generic gray) for about 2 seconds and there are random odd shaped graphics. No pattern, but maybe more towards the bottom left of the screen. Then the login appears and all is well.
I've run the disk utility and repaired everything. All seems normal. I've never seen this before and wondering if anyone might have insight into why this might be happening.
Thanks,
Robert

Reset PRAM.  http://support.apple.com/kb/PH4405
Best.

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