Help! My G4 tower won't start.

Hi. I hope someone can help me. My G4 tower won't start. It was on during a power loss and won't come back on. This happened once before several years ago and a tech at work was able to fix it for me. I remember him pushing some sort of 'reset' button inside. I opened up my G4, but can't find this reset button.

Anyone got any advice?

Cheers,
Ben

what is the model type? The G4 is not a machine model, merely a processor class (The MPC 75xx) I assume Power Mac G4, but is it silver or graphite colored? do the drives have a chrome cover?

Sounds like you do need to reset the PMU or CUDA switch. Here is a link on how to do this:-

Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3

harryb2448 said:

Sounds like you do need to reset the PMU or CUDA switch. Here is a link on how to do this:-

Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3

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Thanks for this. It was exactly what I was looking for.

Cheers,
Ben

You also might want to check your PRAM battery. It should be 3.6 Volts DC. When it's dead issues like yours can happen.

dtravis7 said:

You also might want to check your PRAM battery. It should be 3.6 Volts DC. When it's dead issues like yours can happen.

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Thanks for this tip. The previous suggestion worked, but I'll keep an eye on this if the problem re-occurs.

Cheers,
Ben

superpapaben said:

Thanks for this tip. The previous suggestion worked, but I'll keep an eye on this if the problem re-occurs.

Cheers,
Ben

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The date and time will start to be wrong...you will know its the battery.

I have all my OSX Macs set to update the date and time right at startup. I have had a dead PRAM battery for ages and did not know till all of a sudden it would not even post.

dtravis7 said:

I have all my OSX Macs set to update the date and time right at startup. I have had a dead PRAM battery for ages and did not know till all of a sudden it would not even post.

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Good Point...Im just not an automatic guy

Mac SK said:

Good Point...Im just not an automatic guy

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I just like to be sure the time is dead on. With Windows unless you go force it, it takes days till the next update. I love OSX as it seems to always be checking the time with the server.

dtravis7 said:

I just like to be sure the time is dead on. With Windows unless you go force it, it takes days till the next update. I love OSX as it seems to always be checking the time with the server.

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I work on windows machines by day and after a while you dont want to see or hear the word..... A u t o m a t i c.