Dual core G4 won't turn on

[Badoug]

Hey everybody,
I have a Dual core 1.42 G4 that will not power on. What happens is... I push the power button on either the tower or moniter, the buttons light up, the fans turn on, once the hard drive starts to spin up, the whole system shuts down.
I have swapped the RAM around to see if that mght have been the problem and completly disconnected the hard drive. There was no change, what would be the next steb in diagnosing this problem.
Thanks,
Doug

 

[harryb2448]

G;day and welcome to the forums.

First up try replacing the little PRAM battery as MDD models will not boot at times with a dead battery. Then reset the PRAM and PMU (Power Management Units) to see if there is any joy. Here is alink on this:-

http://arstechnica.com/civis/viewtopic.php?f=19&t=220142&p=5404793#p5404793

Keep us posted?

 

[Badoug]

Thanks, I have a feeling I will be making a lot of use out the information here. I replaced the PRAM battery and that was the problem. Now she fires right up again. It makes sense, since the clock would reset when I would turn the computer off.
If I end up making it down under anytime soon, I will have to buy you a Victoria Bitters (that was the beer my brother brought back on his last trip to Sydney, yum!)
Thanks again,
Doug

 

[harryb2448]

Your brother is a dirty traitor as VB is Melbourne beer! Make it a Blondie or a Hahn and you have a deal. That clock resetting is always a sign of a crook PRAM battery.

 

[Badoug]

At least I didn't offer a Fosters

 

[harryb2448]

True true!

Keep coming back to the forums as they are a great place to learn!

 

[Badoug]

The computer is still having the same start-up problem. In order to get the machine to turn on, I have to unplug the AC power cord for a few seconds and press the PMU reset button. Could this be a bad logic board or some other culprit?

 

[harryb2448]

Try a reset of the PRAM next time you have this problem:-

Cannot Reset PRAM? - macosx.com

Keep us posted.