Hello. In the last year, my 24'' Imac(2008 model) have been acting weird on me. I am facing burn-in in the screen, but the biggest problem is the random crashes. I will say that every day I get around 10 freezes, were the system hangs completely. I downloaded temperature widget, and it didn't seem to have a problem with heat. On the other hand, I rarely hear the fan anymore, but that just might be my imagination. I upgraded to Snow Leopard and it sort of made it worse. The programs that usually make the system hang are Itunes and Firefox. They are the sinners, but it seems to be related to everything that requires heavy computering. I tried doing a boot camp partition, and the system hang in the middle of it - When I opened it again, the space was gone but the partition was not created, so I lost 200 GB of space somewhere, and I don't know how to get it back. I tried using the disk utility but it couldn't fix the problem with my hard drive. I can't really afford to take the machine in for repair as I need it for work non-stop. My big question is now: Should I use time machine, to back up all my stuff and programs, and then reformat the whole OSX from scratch or is it a hardware problem?