Screen freeze with odd squares and occasional crashing

I've had my new IMac 27" (2.66 Ghz i5) for a couple of weeks and it's crashed more times than Windows Vista ever did (about 7 times so far). Every now and again, the screen freezes (sound keeps going) and strange squares appear. The only solution is to hard reboot using the on/off switch.
Today it had trouble starting up again, requiring 2 or 3 goes before coming back to life.
Help! Any suggestions/fixes? Is this a common problem?

Thanks for this. Just taken a look at the Console log and the following is listed at the time of the latest crash:
07/04/2010 10:54:11 Safari[5200] * __NSAutoreleaseNoPool(): Object 0x10061fc40 of class NSCFString autoreleased with no pool in place - just leaking
07/04/2010 10:54:11 Safari[5200] * __NSAutoreleaseNoPool(): Object 0x100620140 of class NSURL autoreleased with no pool in place - just leaking
07/04/2010 10:54:11 Safari[5200] * __NSAutoreleaseNoPool(): Object 0x100620180 of class NSURLRequest autoreleased with no pool in place - just leaking
07/04/2010 10:54:11 Safari[5200] * __NSAutoreleaseNoPool(): Object 0x100616c20 of class NSCFString autoreleased with no pool in place - just leaking
07/04/2010 10:54:11 Safari[5200] * __NSAutoreleaseNoPool(): Object 0x100622c20 of class NSCFString autoreleased with no pool in place - just leaking
07/04/2010 10:54:11 Safari[5200] * __NSAutoreleaseNoPool(): Object 0x1006169a0 of class NSCFString autoreleased with no pool in place - just leaking
07/04/2010 10:54:11 Safari[5200] * __NSAutoreleaseNoPool(): Object 0x1006181b0 of class NSCFString autoreleased with no pool in place - just leaking
07/04/2010 10:54:14 Safari[5200] * __NSAutoreleaseNoPool(): Object 0x100613b60 of class NSHTTPURLResponse autoreleased with no pool in place - just leaking
07/04/2010 10:54:14 Safari[5200] * __NSAutoreleaseNoPool(): Object 0x10061e370 of class NSCFData autoreleased with no pool in place - just leaking
No idea what all of this means, but it sure doesn't sound too good. Can anyone shed any light?

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Screen freeze with odd squares and occasional crashing

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