I just picked up a PPC 1.8ghz 20" G5. Where I stand: I have put a brand new hard drive in the machine. I took off the plastic bezel to the power cord, to make sure it's plugging in all the way. I turned the computer on while watching the LED's on the logic board. All 3 stayed on, and the 4th never came on. I have unplugged it, left it unplugged for a few minutes, plugged the cord back in while holding the power, then turned it on (forgot what that was supposed to accomplish). No change. I have reset the PVRAM (or whatever) 3 times in a row by holding command-option-p-r until I heard 3 chimes after the initial boot. No change. I can get into open firmware, but have no idea what I could even try in there (other than ejecting the DVD). I hold down "C" while booting, it chimes, it goes to a blank grey background, then proceeds on to the white screen with the apple. It sits there for a few seconds, then starts spinning the circle for a while, then shuts down. I hear the optical drive spin up, but it does nothing. If I hold down the command key, it chimes, goes to a gray screen with a circular arrow on the left, an arrow pointing to the right on the right, then eventually a DVD icon with "OSX Install DVD" in the middle. I can't get it to move past there. It either proceeds to the white screen with the apple, and does the same sit then turn-off thing, or it just turns off. The DVD in there is an original Leopard (10.5) version of OSX. The computer had an earlier version on it before, but I don't know what that is, and the HDD in there now is blank from the manufacturer. At the end of a normal turn-on (not touching anything), what I get is: Chime, gray screen with face/flashing question mark (as I understand, looking for system files to boot to an OS), then to a white screen with an apple where it sits for a few seconds, then a circle starts spinning and it will do that for maybe 30 seconds to 90 seconds (very rough estimate), and then it will shut off. Help?