So.. My first Intel iMac 20" core duo (2006 model, first Intel shipped) is failing to boot. At first it would boot into the hard drive but it had a lag to everything you did. I rebooted to the leopard cd and did a disk repair and it failed, said the drive was corrupted and needed to be formatted. I have yet to do the format as I was planning on replacing the hard drive. Any other ideas of what this might be? hard drive worth replacing or is it something else?