[ivories07]

Bought a used g3 i-book on ebay (mistake perhaps). Advertised "everything works" -- which it did for 48 hours.

I decided to upgrade ram and installed a 512k sodrimm. Proceeded to attempt to load new OS (10.4 upgrade to the existing 10.2 OS).

Upgrade choked in midstream -- on the reboot, the computer did not "see" the hard drive. Presume the volume wrapper got scrambled. Used Disk Warrior to attempt to rebuild directory, etc. Disk Warrior did not/could not finish the rebuild. Proceeded to attempt to re-load 10.2 OS. Reload would not succeed.

After this sorry chain of events, I attempted to boot from CD back to disk warrior, also the OS install disk. Although the chime sounds, the apple logo appears, and the spinning gear wheel spins on and on, the system will simply not boot. As though it could not read the CD. However, I tried external drives, "option" boot, none of those helped. Cleared the vram and the pram, still no luck. Note: also reinstalled the original ram card, that did not help either.
Took the shell off, tried the "pressure on the logic board", that did not help. Interestingly, on "option boot", the system recognizes the disk in the CD -- just can't seem to do anything with it.

Anybody have any ideas ? I'm out. I find it hard to believe that replacing a memory card could possibly have blown the logic board -- it did do an incomplete boot (OS came up but hard disk did not show and disk utility did not work) at least once after that but not since.

[Serge_N_Gin]

Did you try placing the original RAM module back in the iBook then seeing if you could get it to boot?

[ivories07]

tried that but it did not help.

After about 3rd PMU/NV-ram reset and booting from external drive I got it back; then installed new CD player and now I am back to where I was before.

[Serge_N_Gin]

It sounds like you've got it all sorted out now? Thanks for posting the fix for others to see.