Power Macintosh G3 B&W not booting — #13

Post #13 by yntzl

Source Forum	Power Macintosh G3 B&W not booting — #13
Category	Hardware
Post Date	Tue, 30 Apr 2013 - 20:51
Original URL	https://68kmla.org/bb/threads/power-macintosh-g3-b-amp-w-not-booting.27926/

Post

Have you tried removing the PRAM battery altogether? I know the G4 PowerMacs will not boot with a flat PRAM battery but are just fine without one at all. It was a fast trick for "reviving" "dead" PowerMacs.

Even booting without the PRAM battery the problem persists, a few seconds after the startup chime the Mac beeps 3 times, I tested with six modules of RAM in every slot, and I don't think that all of them are bad.

Four beeps means there's a problem with the logic board, although I don't know which one it is. According with Apple manuals, it means "Bad checksum for the remainder of the boot ROM ". That doesn't mean a problem with the boot ROM, but a problem in the verification test each system runs in each boot. Verify you've placed the jumper block properly, that might cause the problem. Maybe one of the jumpers you were using for the overclock is broken. If you're using the original block of jumpers, you shouldn't have that problem.

The pins and the original block of jumpers are fine, and visually there is no sign of problems on the motherboard.

I ordered a new CPU, when it arrives I'll test again and if the system don't boot up, I'll need a new logic board.