About a month ago I was here looking for advice on my 2007 24" iMac, which died. Attempted fixes included erasing the HD several times, repartitioning it, having it fail to reload the OS, or the second installation disk, etc., followed by having Diskwarrior confirm the HD was failing. Earlier today I was preparing to box it up for a future project and decided to make one more attempt reinstalling the OS, so I plugged it in (it had been unplugged for several weeks), started it holding the option key with the OS installation disk in, once booted re-erased the drive and partitioned it, then ran install. It installed, and it's up and running now. While I'm pretty sure I need to replace the internal HD, I don't understanding why it's up and running now. Is this just a ghost in the machine kind of thing? I'm almost afraid to run Diskwarrior again (but of course will). I guess I'm just wondering if anyone else has had a similar experience.