I've had my iMac for two and a half years (20" Intel Core Duo) without any trouble but it's died a bit and I'm really hoping someone can help. About a week ago I was installing the latest Leopard update and rebooted the Mac when it requested it. After half an hour it was still booting and hadn't got back into Leopard so I held down the power button and tried booting it up again. What it then did was boot up to the grey screen with the loading circle, stayed there for about 10 minutes and then rebooted itself. It did this over and over again so I knew something was wrong. I booted up from CD and tried to do a disk repair but it said it couldn't repair the disk. So I booted up from TTP and did a full system test which found 69 bad sectors on the disk which it fixed. When I then rebooted it did exactly the same as it did after I installed the Leopard update. It started booting MacOS and after half an hour it still hadn't loaded. This was when I decided it was time to just wipe the entire hard drive. So, I booted up from the Leopard CD and used Disk Utility to erase the entire hard drive (Just the single zeros method) and then tried to carry on with Leopard installation. Installation failed because it said the hard drive wasn't bootable. I assumed this was because I'd partitioned the hard drive incorrectly but it was late and I wanted to get to bed so I just switched it off intending to sort it out the following day. Now to the REAL problem. I can't boot the Mac at all. When I switch it on I get the "dong!" but the Apple logo doesn't appear. Not even if I hold down "C" to boot from CD (Leopard is in the drive). I even tried holding down the Option key so that I could select my boot volume manually but this didn't work either. Please tell me my Mac isn't borken.