Imac shutting down by itself

OK - i'm going to type this as quickly as possible before the problem occurs again and I have to type this again.
I bought a Revision B Imac last July. In November, it started to turn off by itself for no reason. (it wouldn't shut down - it would just turn off). It did it about 5 times in the one day, sometime it would be on for a couple of hours before doing it, others it would only last the minute. But by the end of the weekend, it stopped doing it. It started again a couple of weeks later, then once again stopped. I never took it into apple because I know what their support is like, and I know that the problem most likely wouldn't occur when the tech was looking at it. I might not have any problems for more than a month, then suddenly, it would start again. Well today, it has started again. It's done it about 10 times already. It does it when it's on idlle as well as when I'm actually using it. I guess my question is, how many other people have experienced this problem? Just wondering if apple would be aware of it happening to other people.
Just on another note - I didn't think these screens got screen burn. Just noticed the last time my computer was starting up that the outline of the dock has been burned into my screen. I'm kind of annoyed by it.

We have 3 G5 imacs bought June/July 05. In early December one of them started to turn off by itself for no reason. (as Kjays it wouldn't shut down - it would just turn off). It did it about 5 times a day, sometime it would be on for a several hours before doing it, others it would go while starting up. We ran the diagnostic disc but it could find nothing wrong .We reset pram with no effect. The problem persisted for over a week so we booked it into Microwarehouse (where it was purchased) for repair but then it stopped doing it so we cancelled the repair because they said they would charge if they could find nothing wrong.
It was fine for a couple of weeks but it has now started again.
We have also changed the power lead, and taken the disc off the end etc as suggested with no effect.
The serial no W8524xxxxxx is just outside the W8435xxxxxx - W8522xxxxxx list on Apples website within which a recognized problem is occurring
I'm worried about booking it in for repair because as usual I suspect that the problem won't occur when a technician is looking at it.
Anyone have have any suggestions or update on Apples response in store ?

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