Hi, new to this forum but not to mac. I have 2 internal HD, one with 10.4.9 and a clone that still has 10.4.6. Now the first one is giving kernel panic at startup. (Panic we are hanging here...thing). I am able however to boot in safe mode. The hang occurs as the kernel starts to load, i think. I ran Techtool 4.5, Disk Warrior 4.0, Disk utility booting from the other HD. At first it showed allocation overflow in 3 files (mach, mach.sym, other can't remember). I then deleted them as instructed elsewhere, and finally Disk Util and Tech tool said Disk OK, but it still happens. I did the pram thing also. Before doing archiving and install, should i try copying the mach_kernel file from the working internal, or is that a stupid thing to do? Is there a way to fix the kernel, or is that what archive and install is supposed to fix? I am reluctant to do the archive install, as you can see. Thanks for any light shed on this problem.