PowerBook g3 wallstreet not powering up

I have a nice g3 wallstreet that will not do anything, apart from the led light comes on and the hard drive spins up, and fan if there is one, couldn't find it, anyways, checked obvious things, hard drive, processor card and ram all good, pram battery has been removed and the reset combination does not work, so I am at a loss at the moment, any ideas?