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RandallS
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Click here to see the profile of this user 		1.42 Power Mac G4 - 2009/09/16 17:43 I got a G4 Power Mac 1.42 MHz. When you press the power button, it will not come on. If you unplug the Mac for the AC and plug it back in, the press the power button, it will come on and boot up! If you shut down and try to start up again, by pressing the power button, it will not come on. You must unplug the AC every time, before it boot. I have Zap the PRAM. Reset the motherboard and the battery is new and good. What's wrong with it?
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krowmagnum
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Click here to see the profile of this user 		Re:1.42 Power Mac G4 - 2009/09/17 06:58 Sounds like the power supply. PSU issues are a fairly common problem with the MDD G4's.

If you have a multi-tester you can check the voltage out of the PSU when the Mac won't boot. Here are the voltage pin-outs for the MDD:

http://atxg4.com/mdd.html
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RandallS
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Click here to see the profile of this user 		Re:1.42 Power Mac G4 - 2009/09/17 18:15 I read on Apple's Forums, which said "Use a volt meter, black in pin 12, red on pin 14. Should read 25 volts. pin 1 should read 5 volts". Well it don't read nothing on ether pins, 0 volts. Until I pull the AC plug and plug it back into the AC. Then both was right. 25 volts on pin 14 and 5 volts on pin 1. So I booted up and then I shut it back down. Both pins went back to 0 volts after shut down.

I did the 3 or 4 times in a row. Same thing every time. You think my power supply is bad or what?

Where is a good place to buy a new one?
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krowmagnum
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Click here to see the profile of this user 		Re:1.42 Power Mac G4 - 2009/09/18 13:40 The power supply would be the most likely cause. I can't think of anything else that would cause the intermittent power like that. If you can test the components in the power supply you could probably track the problem down but I don't know anything about it or where to find any info on it.
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harryb
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Click here to see the profile of this user 		Re:1.42 Power Mac G4 - 2009/09/18 16:10 Agree with Krow.

Have a look at this link as it offers a number of suggestions. You say the PRAM battery is fine. Restarting as you describe is pretty heavy on the battery and as they have a use of about three years, might be worth another shot.

http://discussions.apple.com/thread.jspa?threadID=1672716&tstart=15
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krowmagnum
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Click here to see the profile of this user 		Re:1.42 Power Mac G4 - 2009/09/19 09:37 harryb wrote:
Agree with Krow.

Have a look at this link as it offers a number of suggestions. You say the PRAM battery is fine. Restarting as you describe is pretty heavy on the battery and as they have a use of about three years, might be worth another shot.

http://discussions.apple.com/thread.jspa?threadID=1672716&tstart=15

Harry,
Those guys on the Apple forums have a thing for PRAM batteries. I don't get it....Maybe they have stock in battery companies or something. The PRAM battery seems to be the catch-all fix for everything posted on the Apple discussion groups.

PRAM batteries are NEVER the cause of serious problems in my experience. A select few of the older Macs and Mac clones did need a good battery to boot but most Macs do not. For years at least half of my Macs have had dead PRAM batteries and I never had any problems other than losing date and time if the power was out for an extended period. I'm pretty sure my current DP1.25 MDD G4 has a dead battery in it as I'm writing this. If it's plugged into a power outlet the PRAM settings will not be lost.

It's a complete waste of time and money in my opinion if the battery has not been tested to be dead. Test the battery under load and it should read 3.7v or close to it. If it's dead replace it if you want to spend the time finding one and paying $10 + for a tiny battery.

The sad fact is that the MDD power supplies have a higher than average failure rate. Which is why they are expensive to buy on the used market. High demand and low supply.

just my .02 worth
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