G4 MDD FW800 starts up and shuts down after several seconds

Hi all,
My G4 MDD FW800 DP.1,48 starts up and shuts down after about 20 seconds. I Have reset PMU and checked battery voltage, witch was OK. (also had it out for 30 minutes with no power connected etc.) I have video and also tried with NOTHING connected. But still it just powers down and failes to enter start up procedure.
Last time I had it running I pulled my iPod, beacause the computer did't see it, the next thing I saw on screen was the message to hold the power button for 5 to restart, after that I got the problem described above.
Anybody?
Thanks,
G4 MDD FW800 DP1,48 Mac OS X (10.4.2)

Hi, I don't know how fast it shuts down, but...
How to reset the SMU/PMU on a Power Mac earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/ht1379
In fact, do 3 in a row, takes a bit of time.
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)

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