I purchased a 24" iMac in fall of '07 and up until have had no problems at all. Let me describe the problems I'm having now and maybe someone can tell me what to do to remedy them. A couple weeks ago it started freezing randomly. The mouse will switch to the beach ball and just spins endlessly. I can move it around but can't really do anything other than that. I have to do a hard reset to get it back to normal. Sometimes a couple programs are open, and sometimes none. It seems like it happens often when I quick switch from one user to another. It will switch, work for awhile, then freeze. Now, no big deal, annoying, but whatever. But, the other day after doing a hard reset it revolted into a white screen with a flashing folder with a question mark. I did some research and found that I needed to repair the startup disc using the snow leopard disc. I did that and it allowed me to boot it back up normaly but didn't really solve the freeze up issue. So, that just happened again, so I'll have to boot it up with the disc again and repair the startup disc when I get a chance. It's really beyond frustrating now. I have repaired all permissions, updated all firmware, made sure the drive isn't full, pretty much everything short of backing up and wiping the drive and reinstalling the OS. Is that what I need ro do now? I mean, I know I need to, but is there something I can do to remedy until I can get around to doing that? Thanks for any help.