[cubanpete]

Apple has officially told me their is no reported reason why my Dual MDD Power Mac G4 won't go to sleep. They have no explanation why the keyboard and mouse will often freeze, or if I do get my Mac to sleep why it goes into a coma. I 've replaced the power supply, reset the pmu removed and reinstalled my memory and replaced the agp graphics card. A Mac Genius at an Apple store said it was my 17" lcd Studio display. I now have a 23" Cinema Display and still have a "sleeping disorder". Any ideas?

[seanc]

Got any 3rd party USB 2 or FireWire PCI cards in there?

They're often a problem with MDDs and sleeping.

[cubanpete]

Yes, but I thought of that too, the problem actually has been going on before that and someone else had told me the keyboard mouse freeze was due in part to the usb port on the mb being bad and to try a pci usb card to bypass mb.

[firefly]

If I had a problem like this I would personally try taking every single component back to stock (take out upgraded RAM, HDs, optical drives, everything) and do a system restore with the original CDs. See if the problem persists. If it doesn't and you can then sleep, add things back one by one and see what causes the Mac not to be able to sleep.

[TieBie]

I tought it was a known fact that the SCSI-card is preventing the G4 to go in sleepmode. Is that the case?
My brothers MDD dual 867 had the same problem. Refitting the scsi-card (adaptec 2910?) with a retail version (2930??) form an old G4 fixed the problem.
(I don't know exactly the card versions. Can look for them if you wish)

I had a similar problem with the G4 dual 500, which source lay in the Radeon card (the original one). A firmware update and a search for the CUDA reset button solved this.

Strange behaviour indeed and also strange solutions.