QUICKSILVER: Power problems even after replacing PSU

When I press the power button. The light comes on and fades out.
Before I replaced my rev D power supply with a rev C, the fan would turn about a 1 centimeter when I pressed the power button. Now it does not do that.
The ebay seller claims the power supply was good, but I'm not so sure. Does it make a difference that it's Rev C? This is the PSU I bought:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=300256905483&ssPageName= STRK:MEWN:IT&ih=020
What would cause something like this?

Your internal memory battery may have discharged & needs replacement. Also try a PMU reset. See Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
 Cheers, Tom

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