After shutdown iMac won't restart until you unplug & wait 10 minutes

So I have an iMac G5 20" iSight, works perfectly, just one small problem. When you shut it down, you cant turn it back on until you unplug (the power cord) and wait 10 or so minutes, once you do that and plug it back in, it works great. as you probably can guess, when I have to restart for update its annoying. Any ideas? I have tried to reset the SMU by unplugging it plugging it back in and hold the power button, release and press the power button once. This doesn't seem to help. I have also checked my serial number for bad capacitor problem, but my model isn't affected. Thanks in advance.

Dear Miriam,
I just had a look at jimwarholic and it seems that my serial number is one of these;
"Which iMac G5 computers are affected by the iMac G5 Repair Extension Program for Video and Power Issues?
The program is available for certain first generation iMac G5 models that were sold between approximately September 2004 and June 2005 featuring 17- and 20-inch displays with 1.6GHz and 1.8GHz G5 processors.
The affected iMac G5 computers have serial numbers where the first 5 digits fall into the ranges noted below.
Serial Number ranges:
W8435xxxxxx - W8522xxxxxx ----- that's mine!!
QP435xxxxxx - QP522xxxxxx
CK435xxxxxx - CK522xxxxxx
YD435xxxxxx - YD522xxxxxx"
Is this really bad news? my friend Dave bought the computer (2004 I think) and then sold it to me because it was driving him mad, (he took it to apple and they told him "it was the video card on the motherboard -and to fix it would cost £500)
I was hoping either they were lying or that they hadn't looked/diagnosed properly, but now I'm really not sure
I would be most grateful of any advice/help
thanks
Pete

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