Corrupt MacBook Pro Startup Screen

Hi everybody,
Occasionally, when i start up my MacBook Pro, the sign-in screen background image is corrupt along the bottom and the right hand side (See images below). I can sign in no problem, then all corruption is gone. The laptop always functions perfectly.
Any ideas?
Paul
Purchased: October 2011
Processor: 2.2 Ghz Intel Core i7
Memory: 4 GB 1333 MHz DDR3
Graphics: Intel HD Graphics 3000 384 MB
Software: Mac OS X Lion 10.7.3 (11D50b)

Went to the Apple Store. I was there about 1.5 hours.
The gentleman at the Genius Bar did all kinds of hardware tests and memory tests. Everything passed.
He explained i have two memory chips (memory modes?) and the machine switches between the two, depending on the workload, and it's possible some software doesn't work well with this setup (switching back and forth). So it could be a software problem. If my screen goes corrupt again, he suggested i unclick the "Automatic graphics switching" in the Energy Saver preference pane. This would force the computer to use one graphic mode and, if the corruption stops, we know it's a problem with the graphics. (I voiced my opinion that it's unlikely to be software because the corruption occurs before i'm signed in.)
He checked the logs on the date and time of the corruption in the pictures above and didn't find any entries.
He suggested i take a screen shot the next time this happens. I told him screen shots can't be taken until you are signed in on your machine.
He wanted to take the machine for a few days. I told him i'd have to bring it back at a later date, i have too many personal files i'd have to remove first.
Bottom line, the problem couldn't be identified in the time i was there.
He did question TechTool 6's compatibility with this version of OS X. I'm certain it's compatible (i just checked), but still, when i got home i disabled TechTool's protection features … which normally run in the background. They're turned off now.
It's wait and see.

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