Mac Book Pro Randomly froze up on me

Hey guys,
I posted this on another forum but they seemed to be no help.
This issue happened to me so far twice. Once yesterday and once today, today being a little bit more serious i'm guessing.
Yesterday I downloaded Google Earth 5.0 and used it for a bit, then switch to safari. Once I went to safari, the computer froze up on me and didn't unfreeze. I could still move my mouse around, but that was it.
I decided to click it off and restart it, then it worked fine.
But now i wanted to open a youtube link from my desktop, and then it suddenly froze on me again.
This time when it restarted there was a folder icon and a question mark for a second, and then went to Apple Hardware test (I might of been pressing F2, dont know if this triggered it). I did the test and it said no hardware issues were found, and then even did the extended test. I clicked restart and it went back to normal and ran properly.
Any clue what the issue might be? Is this serious? Should i take it to a store?

I could still move my mouse around, but that was it.
Hmm, this is different from some of the other freezing issues we've seen here. It could have been Google Earth that caused this. If it happens again (cross your fingers that it doesn't) try pressing Command-Option-Esc. If that brings up the Force Quit dialog, you may be able to quit the offending program instead of restarting.
--Travis

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