I have an old iMac, late 2006, 2.16Ghz, 20" screen. The last of the white ones. I do the bulk of my work on a Mac Pro, but the iMac is still in use for internet browsing, emailing and as it's in my bedroom I also use it to watch movies on before I go to sleep. It was behaving a bit erratic the last couple of weeks. Just some odd things that I couldn't really put my finger on. Three days ago I upgraded Firefox to the latest build (36.0.1) and FF would crash each time at launch. I finally got it to work, but not well. I then began to receive warnings from Smart Reporter about I/O errors. And then had a kernel panic as well. The first one in 8 years on this iMac! Blaming Firefox, I trashed it and downgraded to the previous version. I also had Disk Utility run a diagnostic and all was well. Then last night there was a power surge as a light bulb in a lamp next to the iMac went out with a blinding light and a very loud poof, leaving me in an all dark house. Luckily the fail safe in the meter box had kicked in, so no harm done, but after turning everything back on, the iMac showed a flashing question mark. After pointing the iMac to the correct start-up drive, the question mark went away but was replaced by a prohibition sign. Here are my steps after that: I inserted the install cd and did a hardware test. All was well. I repaired disk permissions. I also reset PRAM. Still the prohibition sign. As there is no crucial data of any kind on the iMac I decided to erase the hard drive and do a fresh install. Installation was successful and the iMac restarted into Tiger with no problems, although a bit slow. I immediately got the message to upgrade components, which I did. After installation of those I was told to restart the iMac which I did and after a normal but slow reboot and just before the desktop was to appear, it got stuck on the blue screen. I did another extended hardware test. All was well. I then had Disk Utility check the Macintosh HD and it came back with a lot of lines in red. When I clicked "repair", it couldn't. This is what the red lines said: -Invalid volume header -Invalid node structure -Volume check failed -Error: the underlying task reported failure on exit -Volume could not be repaired because of an error I tried rebooting in safe mode and came into a really cheerful page, saying: -panic: unable to find driver for this platform: "ACPI" Underneath this was the dreaded kernel panic message. After looking for answers some more I found a possible solution and that is to Secure Erase the drive and then use the install disk again. Problem now is that I can't access the drive any more. It's not visible as a start-up drive during reboot (whilst holding down the option key), and is greyed out in Disk Utility. It also doesn't stay on the blue screen any more. After a while the iMac just restarts. So now I'm here to ask you, is this an ex drive? Has it gone to meet its maker? Or is there still something I could try?