I've always been an Apple evangelist when people ask me about buying a computer. I'm starting to see a trend with the iMac. The hard drives are failing at 4.5 to 5 years. I've now witnessed a fourth one. Has anyone else seen this? It's also a bit of a challenge as this is at the window on the "vintage" category at the Apple store. Yes, it's a premium cost for the repair, but they'll stand behind their work. I've upgraded plenty of machines in my lifetime (and have a hard drive graveyard drawer to prove it), but I'm always a bit reluctant to mess with friend's machines. The latest failure is a 2008 20" model (A1224.) Has anyone here replaced a hard drive in this machine? Any thoughts and comments to share? I've watched the OWC video, and have solid experience with their upgrade kits. I guess the removing the glass panel thing has me concerned about the unexpected.