MacbookPro start up screen frozen with "plaid" apple

After the power-up chime, I see a flash of "plaid" pattern black and blue screen, I see the gray screen with apple logo in center with spinning loading wheel.  The apple isn't solid as would be usual, instead it is the "plaid" pattern.  The loading wheel freezes after about a minute.  Screen eventually goes black.
I powered down by holding the power button for about 10 seconds.  A restart produced the same results. 
After disconnecting the power cord, I removed and reinstalled the battery pack, attempted restart with same result.
I was checking an Internet site when this problem occurred (flashing plaid screen to frozen page, with my eventual forced power down).  Probably had Word, iTunes or iPhoto open at the time.
Software is up to date, trash was recently emptied, and I'm running OSX 10.6.8.
Any  helpful suggestions before I make the 90 minute drive to my nearest genius?

Hi ...
Use Lion Recovery to repair the startup disk of if necessary, reinstall the Mac OS X.

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