IMac turns off upon manual sleep!

I have a new 20" 2.4 iMac that has been upgraded to 3GB.
When I manually put it to sleep, all appears normal as if it's going through auto sleep. But when I try to wake it, there is no response. Turns out the computer has been powered down. I need to push the Power button and it goes through the complete cold boot process. Note that I don't get a shutdown sequence or any indication it's doing anything other than going to sleep.
This does not happen when it goes to auto sleep, only manual.
Anyone else have this issue, or can suggest a cause & fix?
Thanks,
ugggh

How are you putting it to sleep? The menu choice in the Apple menu? That seems foolproof.
There is an option in the energy saver preferences to allow sleep with a press of the power button. Regardless of this option, pressing _and holding_ the power button (a few seconds?) will do a hard shut down (usually recommended only as a last resort.) Technically, I guess pulling the plug is the last resort.
option-command-eject will also sleep your iMac. There's always three ways to do everything, right?
I don't think the latest iMacs have the "breathing" power light to indicate sleep. That was handy.
Of course, make sure that no one is interrupting power to the iMac while it is sleeping.

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