ok

you gotta go in. 

turn off computer

 take off the case cover

make sure you ground yourself on the case a bolt or other unpainted surface on the metal framework to get rid of any static electricity you might be harboring.

turn on computer

see iff the cooling fins for the CPU are cool enough to touch,

see if the fans arre moving at a good speed or at least feel a breeze from them.

if all is ok you can figure the board is shot or you have other problems not easily solved.

if not turn of the computer, replace the fans and solder the connections using a grounded soldering gun cover the connections with electrical tape or shrinkwrap..

I'm not buying that you can't get these fans fairly cheap unless you're living in the outback.any decent wholesale eletronics outlet will have them.  You should also check the power fan, clean the computer  thouroughly, check the fins for grease the way Incarnadine said.(be careful removing and replacing the cpu)

also check to make sore your  wiring is good and that all connections are solid

you can do it!

If you aren't mechanically inclined find someone who is - a friend who lives close by would probably do it for a couple Beers +parts.

good luck,

-TJ(Thanks for the links Mahray).