It wasn't my machine... altho i must confess... I haven't checked my owned lately :( So. My scathlingly brilliant flash drive idea didn't work. So I guess my last and final option is to run off to some store to pay some outrageous price for a crossover cable. I'm G5, he's G4. Depending on the price, which I haven't researched yet and am afraid... it may be another two weeks til I can tackle this problem again. What a pain in the youknowwhatsy :)
" My scathlingly brilliant flash drive idea didn't work"
Booting from Flash RAM is a recent trick, as in later than 2006, so his G4 won't consider the Flash drive as a boot volume.
One of the tricks most Mac users don't know about is FireWire Mode.
Say you have a Mac that won't start. You get a Firewire cable, switch off the problem Mac and plug the cable between that Mac to another Mac with Firewire (post B&W G3).
Start the healthy Mac and once it's booted up, you start the first one while holding down the letter "T" on it's keyboard.
It will start up, basically, as an external hard drive. The screen will come on with the FireWire Logo and nothing else.
That will let you copy off the data from the hard drive on the affected Mac, and let you wipe and reinstall it.
But from what you describe, your friend's Mac had a Kernel Panic, almost always caused by a hardware defect.
I mentioned the bad USB mouse I had to chuck. Bad RAM will do it too, and I suspect the hard drive is the culprit in this case.
If you have a local Apple Store, you can take the Mac in.
If it's way out of warrantee, and you're handy, you could replace the hard drive yourself.