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My G4 won't turn on...HELP!

G

graphiqdezine

macrumors newbie
Original poster
Nov 13, 2003
23
0
Hi guys,
I recently painted my office and now that I reassembling everything, I went to hook up my G4 (1.25) and when I press the power button, it comes on, then dims back out. I try this repeatedly, but nothing. No drive spin up, no fans, no nothing.

The light on my cinema display stays on but dim only after I try to turn it on from there.

Help guys.

Thanks.
 
This often occurs on a Cube due to a faulty VRM. If it's a regular PowerMac, however, then there is no VRM. It may well be the logic board, however, or the switch board. Check the switch board first, because it would be cheaper to replace. Try to turn on the machine by shorting the appropriate wires. If that still won't boot the machine, then it's likely the logic board. In which case, she's dead, Jim.
 
graphiqdezine said:
Hi guys,
I recently painted my office and now that I reassembling everything, I went to hook up my G4 (1.25) and when I press the power button, it comes on, then dims back out. I try this repeatedly, but nothing. No drive spin up, no fans, no nothing.

The light on my cinema display stays on but dim only after I try to turn it on from there.

Help guys.

Thanks.
Click to expand...

What model G4? I am assuming PM given the seperate display, but don't want to assume too much. There are some troubleshooting tips here for G4 PMs: http://www.power-mac-g4.com/ - go down the page a bit. I've found some helpful hints there.
 
TLRedhawke said:
This often occurs on a Cube due to a faulty VRM. If it's a regular PowerMac, however, then there is no VRM. It may well be the logic board, however, or the switch board. Check the switch board first, because it would be cheaper to replace. Try to turn on the machine by shorting the appropriate wires. If that still won't boot the machine, then it's likely the logic board. In which case, she's dead, Jim.
Click to expand...
How would I do this and what does it look like?

It is a PowerMac.
 
graphiqdezine said:
How would I do this and what does it look like?

It is a PowerMac.
Click to expand...

I am having the exact same problem, so I too would like to know how to do this.
 
CanadaRAM said:
Before replacing motherboard parts, consider replacing the battery - 1/2AA 3.6V Lithium, should be about US$10
Click to expand...

Just the battery that is connected to the curcuit board inside of the tower?
 
Try the PMU reset on the motherboard. If you tell us what model we can tell you where the button is.
 
I tried the PMU reset, worked like a charm.

On the G4 1.25 tower it is located on the back of the motherboard near the right side (opposite the battery).

I reset it, plugged it in, and to my delight, loud zen.
 
graphiqdezine said:
I tried the PMU reset, worked like a charm.

On the G4 1.25 tower it is located on the back of the motherboard near the right side (opposite the battery).

I reset it, plugged it in, and to my delight, loud zen.
Click to expand...

Excellent to hear - did you find that on the G4 site?
 
law guy said:
Excellent to hear - did you find that on the G4 site?
Click to expand...
sure did.

You'd think the guy could handle creating more than one page rather than an endlessly scrolling one. Good resource none-the-less.
 
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