Black screen, powers up without hitting power button

After 6 months my iMac G5 20" rev. B working fine (other than failing to sleep automatically - will sleep display but hard drive does not power down) I'm having problems. The screen goes black and I cannot re-boot: I get power but the screen either stays black or, sometimes, freezes at gray. I have repeatedly tried resetting PRAM and PMS.
After 1.5 hours with an AppleCare rep, with no success starting the machine, I took it to my local Apple Store and (of course) they were unable to replicate the problem, although they did run Techtool on it all day and found no problems with either the hard drive or the memory. (I'm a little ticked that they didn't even bother to read the notes from the AppleCare rep - the attitude seemed to be that neither the AppleCare rep nor I knew what the heck we were talking about.)
So I took it back home and lo and behold it did start up normally. So (after backing up my files) I did a complete erase with only stock Apple programs reinstalled. It worked fine for a few hours but then the exact same thing happened: black screen, unable to start up although I get power (the screen stays frozen at black for about 60 seconds, and then the fans come on full speed which I understand is because there's no OS running to regulate them). Only now there's one new development: whenever I plug the iMac back in - whether by pulling the plug out of the back of the unit, or unplugging the cord at its far end - the computer automatically powers up without my pressing the power button. That happens even after I've used the power button to turn it off. That seems weird as well as potentially a safety issue.
I have it in for servicing again - this time, to the local reseller I bought it from, because they don't require an appointment and force you to wait around for hours merely watching them run Techtool - after another hour-long session with an AppleCare rep was unable to get it working and the rep said it was "definitely" a hardware problem. I'm just wondering if anyone else has had similar issues: especially the "powers on without pushing the power button" phenomenon.
I have 2G aftermarket RAM but don't think that's the problem because the same issues occur regardless which RAM stick is in the machine, even after resetting PRAM and PMS and doing the system erase and install. Also, the Apple Store did test the memory with Techtool and said it was fine.

After again experiencing problems I took the iMac back to the reseller where I bought it. They were able to replicate the defect and I received a new logic board. The invoiced cost (covered by warranty, luckily!) was $1,067 for the logic board and $85 for labor. The hard drive was erased but OSX Tiger was pre-installed when I picked up the computer. (BTW, Backup 3 is a very nice backup utility!) Now my iMac seems to be working perfectly, and the energy saver/sleep function works normally again.

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    0xffffff807b1d3950 : 0xffffff7f8151dbf7
    0xffffff807b1d39c0 : 0xffffff7f823ad855
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