G4 Dual 1GHz MDD will not power up... button lights up when pushed, but thats it???

[CharlieF]

Hello. I'm new here, unfortunatly my first threads is thus:

I have a G4 1Ghz MDD, it has been working fine. This morning i switched it on, all fine. Then, some hours later, i switched the plug off at the wall. Now, i cannot recall if the computer was on or off, sleep mode is enabled, so i didnt notice. Anyhow, now it wont turn on. The power button lights up when i push it, but htats its. No fan noise, no hard drive noise, no nothing.

Any ideas? where do i go from here? the warrenty has long expired.

thanks.

 

[MovieCutter]

Open your case, and there is a small brown button located on the motherboard near what looks like a short AA battery. Hold this down for about 10 seconds with the computer unplugged and that SHOULD do it (cost me about $50 for AppleCare to tell me this a few years ago).

 

[CharlieF]

Open your case, and there is a small brown button located on the motherboard near what looks like a short AA battery. Hold this down for about 10 seconds with the computer unplugged and that SHOULD do it (cost me about $50 for AppleCare to tell me this a few years ago).

What is it? like a fuse or something?

 

[jacqkeen]

It's the PMU (power management unit) reset. Just had to do this to my DA dual 533 a couple of weeks ago. Had the same symptoms your MDD has and it fixed the problem.

 

[MovieCutter]

It resets something like the CMOS, whatever that is. I think it also kicks the power unit so it behaves the way it should. Not really sure. Give it a shot.

 

[Sdashiki]

not to scare you but thats the model that just one day as I resarted it, refused to stay powered on.

Holding the power button got it to light up and "power up" but release the button, it turned off.

I needed a new logic board.

replaced next morning by applecare (this was years ago)

 

[CharlieF]

Well, it worked. thanks guys!

 

[Sdashiki]

awesome.

glad it wasnt doom.