Hi, I've been looking for an answer to this all over the internet: our tray loading 266 Mhz iMac shuts down within seconds after powering it on. If I leave it unplugged for some time and connect it to the power cord again, pressing the front button will make it chime, you can hear it just start to spin it's HD, it will flash it's green light briefly and then: click, all power is turned completely off within a second or two. In this state it will respond to nothing whatsoever, it seems completely dead (there's not even the faint electric hum that it normally has when you put your ear next to it.) If I unplug the power cord and leave it unplugged for some time, I can make it briefly come alive again, but the same thing happens. I've tried to: boot from CD, reset PRAM, start up with extensions off, replaced the battery, reset the cuda chip, no luck. Any suggestions? I'm having a hard time believing it is truly dead as long as it still chimes... BTW: We had it running OS 8.5.1 still and done nothing special to it in the past weeks either.