My Power Mac G5 wont always turn on

A couple of weeks ago my G5 started not turning on after being shut completely down. When I hit the power button, it clicks twice and turns off in a split second. The odd part is, it WILL turn on if I leave it unplugged for at least 24 hours. When it does boot, it works normally and can be restarted without a problem. Im certain it isnt the power supply because I tested the pinouts based on a service source I found, but I really want to find out what is causing this. Any help would be greatly appreciated.
Specs:
Power Mac G5 (late 2005)
2GB of Ram
Dual 2.0 PPC

Yeah, most Apple stores I hear don't even work on G5s anymore, even for ridiculous prices.
I suspect a bad capacitor on the logic board needing to bleed down, but any PCI cards, USB, or FW devies connected?
Or possibly the PMU itself.
Does it boot into Open Firmware with CMD+Option+o+f ?
http://docs.info.apple.com/article.html?artnum=42642
reset-nvram (press Enter)
set-defaults (press Enter)
reset-all (press Enter)
Have you done a PRAM reset, CMD+Option+p+r...
http://docs.info.apple.com/article.html?artnum=2238

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Same thing happened to my G5 dual (late 2004 model). Just did a quick search to find out "power supply unit failure" is most likely the cause.
Here are some useful links:
This guy replaced the PSU and documented the process:
http://damntechnology.blogspot.com/2009/02/rebuilding-powermac-g5-power-supply.h tml
Taking out the heat sinks to get to the PSU is a challenge. This link shows how:
http://forums.techpowerup.com/showthread.php?p=1476640#post1476640
This repair shop in Fremont CA seems to have pretty reasonable price to do the repair:
http://www.dttservice.com/powermacg5.html
I have owned many Macs for the last 15 years. This is my first bad experience with Apple's product.

Power Mac G5 wont boot.

Hey everyone!
This is my first time posting here, but I get all my technical problems solved here, so thank you to everyone!
Anyway, getting on to my problem (which I cannot find a answer to)
My Power Mac decided the other day it wasnt going to boot up. All that would happen when I pressed the power button would be the red light (on the logic board) would flash while I can the button pressed it, I would hear 2 clicks like a relay, and that was it. Nothing, it would never boot.
So I switched the computer off at the wall, left it for 2/3 minutes, and all was fine, would boot and restart. But, if I shut down the computer, I would not be able to get it to turn back on, unless I switched it off at the wall again.
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Can anyone shed some light on the problem? Just to let you know the computer was never droppped/banged/hit etc etc. I was on it, turn it off to pop out for a hour, came back and its been like that ever since
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Hi James, and a warm welcome to the forums!
Not sure which Mac it is you have with the l essuseful new forums, but it sounds like the classic case of either a bad/low,/dead PRAM battery, or a leaking Capacitor.
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & if weak can cause really strange problems...
See which one your Mac has...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/

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Last week, I formated this computer and reinstalled OS X 10.5. I updated everything, reinstalled all my applications and replaced my documents. Everything was good for a couple days. I have and HP 1350 all-in-one printer (which HP no long has mac support for that model, so I can only use the scanner as a photocopier, but that's not the issue, it prints fine and I have printed files since the formatting) The printer is connect via USB to my Power Mac and then shared on my home network, wirelessly, with 2 other MacBooks and a 27" iMac. My roommate was trying to print something from his MacBook. In the printer queue on the MacBook, the file would say it was printing, but nothing would actually printer. When I went to the printer settings on the Power Mac, the dialog box said the printer was "in use." I reset the printer, nothing happened. I restarted the Power Mac, properly, and now the computer wont boot past the Apple logo. The spinning gear appears and spins for a minute or 2 and then it will just reboot on its own. It will just keep doing this in a continuous loop.
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PowerMac G5 OS X 10.3.4 (Panther) Software Install DVD
Item #:
2Z691-5094-A 1000949
Compatible with eMac (ATI Graphics), eMac (1.0 GHz G4), eMac (USB 2.0), iBook ClamShell, iBook (Dual USB), iBook (Late 2001), iBook (14.1 LCD), iBook (16 VRAM), iBook (14.1 LCD 16 VRAM), iBook (Opaque 16 VRAM), iBook (32 VRAM), iBook (14.1 LCD 32 VRAM), iBook (800/900 MHz 32 VRAM), iBook (14.1 LCD 900MHz 32 VRAM), Except - iBook G4 (Mid 2005), all iMac Flavor, all iMac Flat Panel, iMac G5 (17-inch), iMac G5 (20-inch), Mac Mini (original), Power Macintosh G3, Macintosh Server G3, Power Mac G4 & Macintosh Server G4 - all models, Power Mac G5--all models Except - (Power Mac G5 (Early 2005), Power Mac G5 (Late 2005), PowerBook G3 (Bronze Keyboard), PowerBook G4 - all models Except - PowerBook G4 (Double-Layer SD), Xserve G5, Xserve G5 (Cluster Node), Xserve G5 (January 2005), Xserve G5 (January 2005 Cluster Node)
http://www.welovemacs.com/2z6915094a.html
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Hi Chucklz-
Greetings and welcome to the Apple Discussion boards
Since you have already reset the PMU, you most likely have a bad power supply or logic board.
However, replacing the battery is cheap and easy and if that fixes the problem you will be better off than the alternative: Battery Replacement Instructions
Luck-
-DaddyPaycheck

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Is the startup problem you are having with the Powerbook G4 you list ion your profile, or with a G4 desktop?
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http://docs.info.apple.com/article.html?artnum=106214
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My Power Mac G5 wont always turn on

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