G5 Dual 1.8Ghz Tower wont power up

Hi any help would be useful here, I think I have exhausted most possiblities.
I went on a weeks holiday, and stored the tower in a cool dry lockable cupboard for security. Cabled it back in to mains/monitor etc. Pressed the power button and nothing happens. There is a click from the front of the tower, the power light flashes on once for a short time then fades out.
I have tried resetting the PMU/SMU, unplugged machine for 10 minutes, pressed the PMU reset button etc. I have taken out the most resent RAM upgrade (installed about 4x months ago) still wont restart.
I will now try taking the battery out and leave unplugged for 24hrs, which I am informed on another forum may help.
Any other suggestions?
It's beginning to look like either a power supply failure or possibly a logic board failure.
Unfortunately my machine is out of warranty now…
Message was edited by: Jamieg270

Hi Jamie -- I had a similar thing happen to my G5 workstation. I powered down as normal for the weekend, but when I tried to boot up on Monday morning, I just got a flash from the indicator light and no power up. Nothing had happened over the weekend that should have caused a problem, but I could not get anywhere with it. I ended up taking it to the Apple Store, where they diagnosed a bad power supply.

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dfernandez86-
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ATA Bus (DVD): Pioneer DVD-RW DVR-117D
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