Lights went out, lights came back, Mac didn't.

Quicksilver died, the problem has to be in the power supply. I can get a power supply from eBay, but before I want to be able to remove the suspect one. I was sure I could disassemble and remove it, but now I am not so sure. Is there any place where I could get an instruction's manual? Also, somebody mentioned that an "internal battery" might be dead, (is that a PRAM battery?) my machine has a battery on the mother board, as thick as an AA but half its length, it says 3.6 V but my volt meter shows 2V, so off I go tomorrow to Radio Shack , but just in case, would you guys keep me in mind if luck ignores me tomorrow?
elfarose

Lights came back but I'm still in the dark.
Got a new 3.6V battery, pressed the little button, nothing. Where do I go next? I can't remove the little nasty power supply, other than using a torch; help, please!