Strange issue I noticed after installing MorphOS on my G4 powemac M8841LL.

After I shutdown my system then hit the power button, it doesnt power back up. If I pull the power cord or power off the surge protector, then plug it back in, it powers on.

Is it the way MorphOS powers off the system?

I wouldn't have thought so, does it do the same when you shut down Mac OSX?

It sounds more like a dodgy PSU in mac. :

I have had this issue with a quicksilver.
Eventually the mac went bad.
I use a Powerbook now and the power off is abrupt but at least it comes back up.
If it didn't there is a 4 finger salute you can do to clear the pram (or something like that).

I actually ran into this same exact issue. My G4 MDD is the FW800 version that came with the dual 1.42 CPUs. After using the computer for awhile and I would power down, it would not come back on until you pulled the power cord.

Its been awhile, but I changed out my memory and CPU. Not saying it is both causing the issue, but See what memory configuration you have. The very last memory module I had was actually bad, causing my MDD to behave erratically.

If you are brave, and I assume you have an MDD, You should buy a cheap 1.25ghz single GPU card, OC the card to 1.5ghz, and exchange the CPU card. Keep the card that comes out as a spare.

Doffo: yep...that's the exact setup I have.

i even switched out the PSU and that still didn't solve my problem. Not sure what exactly it was. I also took out the battery since it was long gone dead. But for sure keep an eye on the memory modules and for the sake of, switch to a single 1.5ghz cpu.

double post...

[ Edited by Doffo 12.05.2013 - 02:45 ]

http://forums.macrumors.com/forumdisplay.php?f=145

These guys here have given me awesome information about my macs over the years im sure they can give you some advice.

Did you try to reset the PMU?

PMU?

EDIT: Found docs on google.. thanks! I'll try that out.

[ Edited by TheMagicM 13.05.2013 - 17:44 ]

that didnt fix it..but my battery is bad also since it does not remember the time. Maybe thats the case...

Hmmm. Now that the battery was mentioned, I actually did put in a working battery back into my G4.. Worth a shot.