After a 5 day 24/7 stint as the #GlobalTalk Canvas server, today my $8 HARD OFF PowerMac G4 gave up. It started just infinitely boot chiming, giving me a scare. Pulled the plug as I had to run out for family stuff, but after coming back, she's dead…
Luckily the HDD was unharmed, I was able to pull off the Canvas data file and the Canvas server is now somewhat peacefully co-existing with the Chat server on the G3 Wallstreet (although for some reason it did time everyone out once)
@kalleboo Might very well be, that is a somewhat similar symptom to my PowerMac G5 before we replaced the PSU. Although yours flashes the LED and mine didn't (it would just turn it on, fans would shake, and turn off again). The old PSU passed the basic test (it had power on the pin the service manual recommends testing) but could not sustain the Mac working.
So I would start with that, after the basic things (remove RAM, cards, disk, everything, and try again with as little RAM as possible).
Karl Baron
Miguel Arroz