IMac turns itself off after an attempted RAM upgrade

I took the 1GB from the memory slot and installed
2x2GB which didn't work so replaced the original
1GB and now it shuts itself off after about ten
seconds of attempting to reboot. I've tried all
combinations but nothing works.

Doug,
I work as a sys admin at a college, we bought 90, 20" I Macs last November, we have had 3 break so far with the same problem, and one with a failed motherboard as a result of a bad power supply.
I have been a mac user for over 10 years and to have machines break after 2 months of use is shocking for a company that previously had such a good reputation for quality products.
This is a known issue, and the company that fixes our machines under applecare has admitted that these machines have a faulty power supply. I know the Rev A models had issues with power supplies, but the fact that all the 20" models have a 150 watt power supply doesn't help as this is not enough power to run a power pc plus 20" screen etc.
If i were you i would get it sorted straight away as other people have had this issue and it will only get worse if you dont get the power supply replaced.
Regards,
Kevin.

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