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URGENT HELP - POWERMAC DEAD!

My Powermac MDD G4 is dead! You press the power button and it glows for no more than two seconds, and then fades out. No effort at starting up or anything - completely dead - any suggestions? If you suggest resetting something please explain how to - I really dont know much about these machines!

Powermac G4 MDD Dual 867, Mac OS X (10.2.x)

Posted on Nov 22, 2005 5:38 AM

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15 replies

Nov 22, 2005 5:58 AM in response to Den Watts

Could be one of several different things.
The two most likely are a bad power switch or the system needs a PMU reset.

To reset the PMU:

Open the case.

Examine the motherboard for a flat button about 1/2 the size of a pencil eraser. The button is in different places on different motherboards - I don't know where it is on your particular system.

The button is probably grey, probably near the battery, and should be mounted on a small silver square.

Push and hold the button. (Count to 10)

Let go of the button.

Try to turn on the system.

Nov 25, 2005 11:14 AM in response to AJ

My quicksilver dual 800 refuse4s to turn on.... power light comes on it makes all the usual noises etc hard drives fire up as well. but nothing on the monitor. it has 10.4.3 on and 1.5 gb ram.


i have tried the pmu switch to no avail...

the led on the logic board lights up.

the keyboards capslock light does not.


any suggestions?

Nov 25, 2005 11:21 AM in response to jefstone

Have you verified the monitor and video card are good?

Is all the RAM OEM, or have you added it after purchase?
If the latter, start by removing the ram you added.

If you have 3rd party expansion cards, remove them.

Are the mouse/keyboard connected directly, or through a USB hub, including hubs in a monitor?

If you have a Pro/optical mouse, does it's light come on?
The system should boot w/o a keyboard connected.
It's possible the keyboard or USB port is dead. Try the other port.

Nov 26, 2005 7:01 AM in response to AJ

Yep I tried all that stuff, but thanks for the suggestions.

I think either the Logic Board or the Memory module is dead as there is no light on the capslock or my mighty mouse.

The LED on the Logicboard lights up and the hard drives spin up, likewise the monitor lights up but the screen is blank.

So I think its off to Apple for me...

Nov 29, 2005 7:36 AM in response to jefstone

It refuses to boot again....

It can supply power to the mighty mouse, but not the keyboard (although if you boot up and hold down the mouse button to eject a CD it will power the keyboard)

Everything powers up Hard drives etc, but no visuals on the monitor ( a Sony CRT) although it does turn the monitors power light green.


Any more suggestions guys?

URGENT HELP - POWERMAC DEAD!

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