Mac Pro PSU to power G4 MDD?

[kirkbross]

I have an ailing dual 867 G4 MDD which I think has a faulty PSU... to test the theory, can I just plug the 20 pin connector of my early2008 Mac Pro into the mobo of the G4 and power it up? (leaving the PSU mounted in the Mac Pro).

 

[flatfoot]

I have an ailing dual 867 G4 MDD which I think has a faulty PSU... to test the theory, can I just plug the 20 pin connector of my early2008 Mac Pro into the mobo of the G4 and power it up? (leaving the PSU mounted in the Mac Pro).

I don't know whether that would work but there are guides online that show how to alter a normal ATX PSU so that it can be used in a PowerMac G4.

 

[kirkbross]

So I got the logic board out and noticed several HUGE clumps of dust underneath, the largest being right under the RAM DIMM slot area.

Could balls of dust short something causing a no boot situation and if so, now that I've cleaned it, should I reassemble the computer and try to power it on again?

 

[flatfoot]

So I got the logic board out and noticed several HUGE clumps of dust underneath, the largest being right under the RAM DIMM slot area.

Could balls of dust short something causing a no boot situation and if so, now that I've cleaned it, should I reassemble the computer and try to power it on again?

That might be possible but there's also a chance that the board is already dead due to the shorts. I'd try anyway.

 

[macz1]

Even if they share the same connector, I think the G4's PSU pinout is slightly different from the standard. I would look for pinout description or safer and easier, measure the voltages at the PSU plug of the G4. If you measure strange voltages (anything which is clearly not 0V, +-3.3V, +-5V, or +-12V), there's a good chance it's the PSU...