G4 Dead. Do I need a new power supply?

Recently I tried to start my G4 and nothing happened. NOTHING. The day before I had shut it down using "Shut Down" and it hadn't shown signs of anything being wrong. Yes, it is plugged in.
Does this mean my power supply suddenly died?

I have been messing with my old G4 silver, trying to make it work for the grandchildren. It used to work OK, but the clock had to be reset everytime. Then we didn't use it for about 6 months. Now: Yesterday, I plugged it in and pushed the power button. After some normal-looking gyrations, the screen turned to a black pattern with the message, "You need to restart," which of course did not work. There also was some Chinese (I think) on the screen.
Replaced the battery with one from a friend's computer. Reset the PRAM. Voila, it booted and worked well -- for about 5 minutes. Went black. Would not turn back on.
Took the original battery to the neighborhood Apple shop. It checks out fine.
I put it back in, this time accidentally breaking one of the little plastic side holders. Having now read about the PMU here, I pressed that.
Voila. It booted up, even displaying the correct day and time, and finding the Airport connection. I deleted a few files and was just feeling really good when it went black again. Tried a different outlet. Nothing.
So, is there anything else to try? Is there any hope? I hear power supplies cost $100 or so and must be special ordered (therefore, kids will be home before the computer gets fixed).
I always get the most useful advice in these forums. Hope you can help me this time, too.

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I too have had power supply problems with my HP G60-445 DX Notebook. For the past several months I have needed to jiggle the power cord to get the battery to charge. I finally took it to a computer repair shop. He ordered an internal power supply box and installed it and after a bill of $125.00 for parts and labor found out that it did not solve the problem. Dan, the repair person called HP support to ask if they knew of similar problems and if so what is the problem. Support told him "they don't know of any problems with the power supply" What a lie! The problems are all all over the internet!!! Support told him that if they had to "guess" they would suggest replacing the motherboard. Dan proceeded to let support know that they absolutely know there are problems with their product and they are choosing to do nothing about it. You can tell they have made a piss poor product for years and continue to do so without regard for the consumer! Dan, in his repair shop, has more repairs form HP products and with Compaq products than any other computer! I wish I knew this before I bought this laptop!
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I totally give up!! I restored everything to the ORIGINAL state with drivers AND hardware and STILL everything is not working properly like it was BEFORE the upgrade.
So this has been the WORST experience with Tech support EVER!! I have spent DAYS on the phone for HOURS with these technicians and nobody seems to know what they are doing. They put me on hold every 10 minutes and are gone for 10 to 15 minutes and when they come back, they seem all set on a new solution but when you ask them questions about it, they have NO CLUE how to answer and then they put you on hold again. Nothing gets solved and after HOURS on the phone, I just tell them to stop because we are getting no where but running around in circles that make no sense. THIS A NIGHTMARE!!
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I've VERY upset with how this turned out!! I'm just gonna have to deal with the fact that my computer is permenantly messed up and NOBODY AT LENOVO knows how to fix it. So I'm stuck.
I decided to send back the new power supply and the new graphic card because of this nightmare with tech support. I put everything back to the way it was when I bought the computer and it is STILL acting up!! I just want to revert it back to factory settings .. INCLUDING THE BIOS... but Lenovo said I have to send the WHOLE computer back to them to do that. All I can do from home is restore from a point in the hard drive and that's not enough. I need a TOTAL CLEAN INSTALL. Everything needs to be wiped out and reset, not just restored to a previous restore point. I've done this multiple times and all it does is erase all the programs and stuff I put on the computer. The drivers and other codes are still the same. And then bugs come up and things get all wonky. I NEVER HAD THIS PROBLEM BEFORE I TRIED TO UPGRADE IT!!
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I absolutely LOVED my Lenovo computer! And then I tried to upgrade it. BIG MISTAKE!! Now everything is totally messed up and Lenovo's customer support for technical problems is HORRID!!
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Thank you for your time and for reading this!
Please have a FANTASTIC day today!!
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{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
Please click the "Accept As Solution" on my post, if my assistance has solved your issue. ------------V
This is a user supported forum. I am a volunteer and I don't work for HP.
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