I’ve been having various problems on my G5 that made me get DiskWarrior 4.4. It repairs my disks, thank you. But I’m still getting kernel panics. (If anybody requires more background, see http://forums.macrumors.com/threads/after-erasing-reinstalling-leopard-applications-safari-itunes-not-starting.1945256/ ) I also got the panic trying to boot from the install DVD… only DiskWarrior boots fine. EDIT: At this point I failed to take into account that my keyboard also had issues... So I think that one was a case of Mac not getting the keyboard signal and thus booting onto the main drive. :END EDIT Safe mode didn’t get the panic, but neither did it get me anywhere past the Apple logo, with accelerating fans. Besides booting, I also got panics when moving apps, and when running weekly scripts on Onyx. These were stages in my efforts to get my main disk back to normal. Maybe reinstalling Leopard and using Migration Assistant or Disk Utility to restore from a TimeMachine backup would be needed, as I only restored from within TM which left me to "distribute" all the stuff manually… But if it was only about that, I shouldn’t get a kernel panic when booting from the OXS install DVD, right..? I can only do a normal boot if I repair the boot disk with DW. After that, the Disk Utility may claim the disk needs repairs anyway – and can’t repair, of course. I also get different info from Onyx, as to which disk needs repairs etc… (I should probably remove the internal backup disk, anyway.) At one point Onyx said the main disk is not journaled. I noticed that could be changed from within Onyx, and I did. I don’t know much about journaling but I know I always do choose journaling when formatting disks. Apparently a disk can become non-journaled, then… Supposing I can boot again after another run of DW, what should I check? Can I see the condition of each Dual CPU processor on Activity Monitor for instance? What else should I rule out before moving on to buy a new Mac/CPU or whatever’s required...?