Flashing blue screen - partial restart?

one of our macbook pros (unibody 2009) - is going to a blue screen upon start up; then flashing back into OSX but going back to the login screen when it flashes back in.  Anybody seen this?  Im guessing something with the graphics processors.

I had something similar happen recently, and it turned out to be a corrupted .plist. Try a Safe Boot and see if you can get into the account. If you can, look at all the things disabled by Safe Boot for a possible cause. Also, if there is a different account, or a guest account, try that.
I'm guessing it's a software glitch of some sort. Could well be with a start up item.
Good luck!

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