Power off after putting iMac to Sleep

Have you ever experienced this?
Put you iMac to Sleep and it powers down - not a shut down, but the power goes off - no blinking light, no whirring of the hard drive, no sign of life!
I have read and performed many of the tips regarding NVRAM, SMU, PMU, etc. resets. None have worked.
Situation 1-
Use the 'sleep' command - moments after the machine powers off.
Situation 2 -
iMac screen saver will run for a short time, then screen goes blank, the power light illuminates, the fan spins full speed, and the machine is totally unresponsive to mice clicks or movements, or keyboard entries.
Situation 3 -
Sometimes upon power up, the iMac doesn't start, but you can hear a faint buzz sound from the back of the machine. Similar to audio hum.
These problems occur whether or not other devices are connected to the iMac.
Connections-
Standard USB devices - mice, card reader,
Bluetooth keyboard
Ehternet
Power Settings-
Screen saver 5 minutes
Energy Saver - to sleep when inactive - 15 minutes, display to sleep - 15 minutes.
Various other settings tried with no change in problem.
I suspect the power supply. What's your opinion?
iMac g5 1.8Ghz, 1gig mem Mac OS X (10.4.9)

Any solution to this?
Put you iMac to Sleep and it powers down - not a shut
down, but the power goes off - no blinking light, no
whirring of the hard drive, no sign of life!
I have read and performed many of the tips regarding
NVRAM, SMU, PMU, etc. resets. None have worked.
Situation 1-
Use the 'sleep' command - moments after the machine
powers off.
I began experiencing the same thing this week (two days ago). I also tried repairing permissions, resetting SMU, and removing the iTunes receipts (Library/Receipts) since this is what caused an earlier failure to sleep. The difference is then the computer would not sleep, now it shuts off instead of sleeping.
Situation 2 -
iMac screen saver will run for a short time, then
screen goes blank, the power light illuminates, the
fan spins full speed, and the machine is totally
unresponsive to mice clicks or movements, or keyboard
entries.
Have not yet encountered Situation 2.
Situation 3 -
Sometimes upon power up, the iMac doesn't start, but
you can hear a faint buzz sound from the back of the
machine. Similar to audio hum.
I have experienced this (Sit 3) as well with my LaCie firewire drive connected, sometimes. I have found that powering off the LaCie resolves this, as does unplugging it.
These problems occur whether or not other devices are
connected to the iMac.
Connections-
Standard USB devices - mice, card reader,
Bluetooth keyboard
Ehternet
Power Settings-
Screen saver 5 minutes
Energy Saver - to sleep when inactive - 15 minutes,
display to sleep - 15 minutes.
Various other settings tried with no change in
problem.
I suspect the power supply. What's your
opinion?
iMac g5 1.8Ghz,
1gig mem Mac OS X (10.4.9)
Another difference, I am running OS X - 10.3.9, otherwise the same
Any ideas?
iMac G5 & Beige G3 Mac OS X (10.3.9) 1GB Memory, LaCie Firewire external drive

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Lately, my iMac G5 has been shutting down automatically after putting it to sleep. If I wake it up within a short period of time it is OK, but if I wait several minutes, it must be restarted.
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Welcome to Discussions - Please tell us which model G5 iMac you have (iMac release dates).I don't think you changed anything, I would suggest that you reset the SMU and see if that helps.
Please post back,
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Power off after putting iMac to Sleep

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