Power Mac G5 Dies in its Sleep

I have a 2.3 GHz dual-processor Power Mac G5 purchased in December (**** Apple for introducing the Mac Pro so soon!).
I use Software Update to keep the system and its software current. Since the Mac OS X 10.4.7 update, my system will, periodically, die in its sleep, i.e. striking return on the keyboard does not bring up the login panel. The red light that illuminates when the system is turned on or awakes from sleep is visible through the grill when return is struck but the system remains unresponsive.
When this occurs, I have to depress the power button on the front of the chassis for a few seconds to power down the system. I then need to depress the power button a second time to reboot the system.
No new entries have been added to the panic.log since the upgrade to Mac OS X 10.4.6 in April.

I encountered the same problem, first with another G5 where the fan would blow at high speeds and then crash. Afetr replacing the logic board and RAM, Apple replaced the unit. The new G5 purchased 2 weeks ago,when asleep was not able to be awakened from. I went through everything including reintiallizing the hard drive and bringing the computer back to Apple. They ran the computer and had no problems over 48 hours. When I spoke to one of the technical advisors at Apple, they found that there was a Kernel panic related to a USB device. I had disconnected all the USB devices prior to this time but realized that my Apple 23" monitor was connected to the USB and firwire ports. When I disconnected them, the problems stopped. My Powerbook laptop which is running the OS prior to the latest software upgrade does not have the problem.The problem has now been sent to the engineers at Apple and hopefully they will find a fix. I was uncertain if the problem was with the G5 or the latest software update but it sounds like you found the culprit.
Good Luck

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