G5 not properly waking from sleep

[velocityg4]

Heres my problem. When I wake my Powermac G5 from sleep it will not wake properly. All the drives and fan spin up and the display turns on, however after a few seconds the computer suddenly goes back to sleep. This will repeat after restarting it works normally again until I let it sleep for several hours.

Heres what I have done so far.
1. Ran repair permissions as Administrator and Root user.
2. Updated to 10.4.5 and all other updates (including hardware drivers).
3. Ran hardware test CD and passed all test in extended mode.
4. Reset the SMU (since this replaced the PMU in this model G5)
5. Reset PRAM
6. Reset NVRAM in open firmware
7. Checked Applecare database for other solutions

Computer Specs:
Revision B Dual 2.0 G5 Firmware 5.1.8f7
2.5 GB RAM (2x256mb from Apple) (4x512MB Wintec AMPO)
2x300GB Seagate Hard Drive in RAID 0
Dual Layer DVD Burner from NEC
D-Link DWL-G520 Wireless PCI Card
NVidia GeForce FX 5200 64mb (from Apple)
Mac OS 10.4.5

All third party parts have been installed for three months or more and I have never experienced sleep problems until recently. Does anyone have any ideas as to what the problem may be or other tests repairs I can perform?

If not does anyone know what are user installable parts in the PowerMac G5? I have seen the list in Applecare documentation before, but I can not seem to find it. I need to know what parts must be replaced with the originals before bringing my computer into an Applestore, if need be.

Thanks for any suggestions.

 

[mad jew]

I'd try taking out the wireless card as a start. Macs don't play nicely with non-AirPort cards.

 

[JasonElise1983]

how long has it been doing this? Where i work we have a Dual 2Ghz G5, Rev B. that has the same problem. I've taken the 3rd pary ram out, didn't work. I've completely reformatted it and reinstalled everything. To no avail, it still is jacked up. So you aren't the only one.

 

[velocityg4]

JasonElise1983
This has been going on for about 5 days.

mad jew
I don't think it's the wireless card since it has been installed for over a year without any sleep problems. I will try removing it to see if it works anyways. Thanks for the suggestion.

 

[JasonElise1983]

5 days... the one at my office has been doing it for 5 months. no more warranty, so noone really cares now. Good luck with that.

 

[mad jew]

Something as small as a security update can break the compatibility with a peripheral and the wireless card is usually the most susceptible, that's why I'd start there. Of course, I'd check all the third party components' sites for updated drivers where applicable first.