Sorry for the late reply.
Back @ the library again...
G5, running 10.5.4, IIRC.
Was powered off for a few weeks, when restarting, it hung, couldn't even get Activity monitor to come up, so I powered it down again and now it will not boot up, it hangs at grey screen. I do not have a 10.5 CD to boot with and troubleshoot. I don't recall the kybd combo for Safe Mode.
While cleaning up my messy desk, I found the 10.2.7 CD it shipped w/ [presumably] but I doubt that will boot the machine w/ so much higher OS on the HD. I also tried to zap PRAM, but I now know that I did not accurately remember the key combo.
My next ideas are to try again to zap PRAM w/ the right key combo [command-option-P-R] and see if I can start in Safe Mode [please remind me how], and if no joy, try to boot from 10.2.7 CD.
If someone can mail me a 10.5.x CD, that will be great. Other suggestions welcomed.
TIA,
KBeartx