PowerPC clicks into sleep mode, then clicks right back

Hi everyone. New thing I am experiencing since yesterday - my computer will go into sleep mode, but immediately clicks back on again. It's a Dual 2.7 GHz PowerPC G5 from 2005 running on OSX 10.4.11. At first I thought it was an issue with one of our light switches - because sometimes when you press the switch to turn it off, the computer will wake up from sleep. But that switch is completely off and the computer is still having this problem not staying asleep. What can I do to fix this? Thanks.

Hi Christy, and a warm welcome to the forum!
Most often it's a USB or FireWire device that wakes it up, sometimes a PCI card or even a Monitor.
How to reset the SMU/PMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
http://support.apple.com/kb/HT1436
Earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), see if it sleeps in Safe Mode.
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive

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