That battery holder needs replaced and most likely so do the capacitors on that board. You don't have the PS push button in the back in server mode do you?

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No, the power switch was in the correct position.

I think you are right. Washing it achieved...nothing. I dried it with a hair dryer, took about 10 minutes to dry it completely. Just tested it with a new PRAM battery, and there is still no soft power or sound.

Two questions:

- What tools do I need for soldering on a surface mount PCB?

- Which components need replacing?