[michel]

I have a rev d imac 333, that i was futzing around with trying to get it to work with two 256 meg chips under 10.3 (it never worked, always froze after a few minutes). So now it's back to 192 meg (a 128 and a 64). But here's my latest dilemma.

The machine won't restart. Either from a shutdown or a restart command. I press 'power' on the front of the machine, and nothing happens. No green light, nothing.

Won't restart unless I take the whole thing apart and reset the CUDA. Then upon plugging it in, it starts up on its own.

I've tried replacing the battery. Zapping the PRAM. Resetting the NVRAM via open firmware. Nothing works except resetting the CUDA.

Any insight?

[Detrius]

I have seen some tray load iMacs that do some similar stuff... won't shut down; just reboots. Resetting the CUDA doesn't fix it. I've never had a customer complain, so I've never had to fix it. My guess is that it's a bad logic board.

[Parky]

As you have been messing with the memory, try reseating the replaced 192MB.

It may be that they is a bad contact that is causing this, check the pins, etc for dirt, grease.

Ian

[stuffedmonkey]

I've also had bad logic board batteries give customers problems like that. If it goes close to stone dead - it will give you some funky problems. If you know anyone with a volt meter.... it's pretty easy to test.

[michel]

thanks for all the input.

i did try reseating the original ram, and that didn't fix it.

i replaced the PRAM battery (which is the same as the logic board battery, isn't it)?

i did get it to the point where it would restart, but all of a sudden wouldn't shut down, just reboot. that was with the keyboard plugged into the second usb port. moving the keyboard into the first usb port brought back the 'shut down and no restart' syndrome.

i've finally decided to sell the thing for parts. some friends upgraded their G4-350 to a G4-1ghz and gave me the G4 chip. i popped that into a beige G3 i had kicking around, and got it running at 400 mhz. with an extra radeon 7000 card i had, the G3 is now a pretty good machine for my 4 and 7 year old to use.

thanks again for all the suggestions.