Hi!
This is an other episode from "BigBen tries to make garbage working again".
Years ago, I bought a bunch of PowerMac spare parts. I was interrested by a PSU to replace a dead one in a PowerMac G4.
Within the spare parts was a B&W G3 motherboard. Guess what I tried to boot it up.
Starting by rewiring an ATX PSU to get it working... painfully.
Power on button doesn't want to work, the button itself is fine. But it does nothing, if the motherboard is powered up, it properly shuts down the computer.
Internal speaker won't work... but I did get one bip once. So it is actually working. But can't get any sound, no chime, no system beep from the OS.
Above points meant that I actually did manage to boot the thing. By shorting the ATX gren wire you can power on the PSU. It worked, sometimes.
Then I checked many things without success and I some point I manage to find on a shelf the B&W PSU, why the heck I haven't used it before you may ask? Because I didn't know it was a B&W PSU. (Didn't have the computer case, never had a B&W). But the wiring on the ATX connector just hint me when I was looking for another PSU for cross-testing.
I realized, I made a mistake. Power OK on ATX PSU is +5V. On the G3 it's only 3.3V. Maybe I fried something.
At some point I managed to boot the computer with the right PSU, still using the green wire trick.
Running MacTest Pro several times. Complete logic board tests are successfull.
Still the damn thing won't work properly. If I try to kickstart the PSU using the green wire, CPU led stay green and it's shuting down right after. Holding the CUDA button pressed make some how the computer beging to boot, diagnostic LED going in the right state like it's booting, but it doesn't. No surprise here. Cuda button is not meant to be pressed.
Most tests have done with and without a PRAM battery, a CR2032, but it may not be enough for this motherboard?
What the heck is going on with this Yosemite motherboard (rev 1 of course)?
Is there any hope? I wouldn't mind a stealth G3 in a brand new case as another gaming/bridge machine.
This is an other episode from "BigBen tries to make garbage working again".
Years ago, I bought a bunch of PowerMac spare parts. I was interrested by a PSU to replace a dead one in a PowerMac G4.
Within the spare parts was a B&W G3 motherboard. Guess what I tried to boot it up.
Starting by rewiring an ATX PSU to get it working... painfully.
Power on button doesn't want to work, the button itself is fine. But it does nothing, if the motherboard is powered up, it properly shuts down the computer.
Internal speaker won't work... but I did get one bip once. So it is actually working. But can't get any sound, no chime, no system beep from the OS.
Above points meant that I actually did manage to boot the thing. By shorting the ATX gren wire you can power on the PSU. It worked, sometimes.
Then I checked many things without success and I some point I manage to find on a shelf the B&W PSU, why the heck I haven't used it before you may ask? Because I didn't know it was a B&W PSU. (Didn't have the computer case, never had a B&W). But the wiring on the ATX connector just hint me when I was looking for another PSU for cross-testing.
I realized, I made a mistake. Power OK on ATX PSU is +5V. On the G3 it's only 3.3V. Maybe I fried something.
At some point I managed to boot the computer with the right PSU, still using the green wire trick.
Running MacTest Pro several times. Complete logic board tests are successfull.
Still the damn thing won't work properly. If I try to kickstart the PSU using the green wire, CPU led stay green and it's shuting down right after. Holding the CUDA button pressed make some how the computer beging to boot, diagnostic LED going in the right state like it's booting, but it doesn't. No surprise here. Cuda button is not meant to be pressed.
Most tests have done with and without a PRAM battery, a CR2032, but it may not be enough for this motherboard?
What the heck is going on with this Yosemite motherboard (rev 1 of course)?
Is there any hope? I wouldn't mind a stealth G3 in a brand new case as another gaming/bridge machine.