see ive got a pentium 120 MMX but it doesnt start. i think the power converter/fan assembly is fucked but i dont know where i can find another one.
It doesn't start at all? So when you push the power button, nothing happens? No fans start up, no POST, etc? If that's the case, then it is *probably* the power supply.
I remember a similar case with my aunt's old Pentium 166. They said that one day, it just wouldn't start. *Poof*, like that. So I took it, tossed the old power supply, and put in a 200W "el cheapo" kind that I had salvaged from an old 486DX2 system. It started right up. Windows 95, yuck.
Anyway, in the meantime they had bought a new 1.5 GHz P4 Dell, so they didn't even want the thing back. I asked them if there had been a big lightningstorm the night that their old PC stopped working. They said "Umm, I think so." So that was that. A running PC on an unprotected wall outlet during a lightning storm = fried power supply.
As for your problem, if it IS the power supply that is at fault, then getting a new one is easy. If your computer is in ATX formfactor, that is. And guessing from the processor type, it probably isn't. It is more likely to be of the older AT formfactor style. Brand new power supplies are hard to get for such systems, as most (if not all) PC components manufacturers stopped making them many years ago.
If you really want to get your old system up and running, I can sell you another 200W "el cheapo" power supply that I have in storage for $5. Or you can get a nice, new ATX formfactor power supply and use a nifty ATX-to-AT converter cable, similar to this:
This was found on
www.pcpowerandcooling.com, one of the better PC power companies out there. You can also get a power supply from them, or somewhere else, such as
www.antec-inc.com, another manufacturer of high-quality power supplies.