My eMac (1ghz, 768M ram) has been running slow lately, presumably just because it's old and I browse with lots of tabs. Yesterday it was hung up, and I heard a clicking sound, sort of a "tick tock" that I've never heard before. I manually shut it down by holding the power button. Today I couldn't get it to start up. At one point while trying to get it to start up, I got some text about a kernel panic at one point, and I took pictures of the screen that I could post here if necessary I started up with my Mac OS 10.4 disc, and opened Disk Utility. I have a book that said I should do "repair disk," but the buttons to repair the disk, verify the permissions and so forth were all gray so I couldn't click on them and do anything. I have a Firewire disk I use for backups. I made it into a bootable backup a long time ago, when I was using 10.3. When I'd booted off the OSX disc, I tried to set the external drive as the startup disk, but it wasn't there as a choice. I also have a more recent backup which is stored in a sparse image (created with Superduper) on the same drive. I tried to see if I could restore that onto the internal drive using Disk Utility, but it was gray, not recognized as a volume I could restore from. So, how can I either repair the disk or restore from the sparse-image backup? Am I likely looking at a hardware problem? I do have another eMac in the house that I might be able to use until I get things figured out, but it's an older one, 700 mHz with low RAM. I think it has 10.3. If my eMac's toast I'm going to have to get a new computer, which I was planning on soon anyway. PS: I have a hardware test disc, but it's an older one that came with Panther. I haven't tried it yet.