Hi all, working on a friends old PC and found the problem to be the hard drive. The drive does not run, and with the power connector connected the system appears to be dead. Only by removing connector to drive and mains lead into power supply, waiting a couple of minutes will the mother board power up. It's like the drive cuts out the power supply and it can only be "reset" by removing the power. My actual question is, can the circuit board part of a Maxtor hard drive be replaced from another one. The drive when last working wasn't particually noisy so I think the moving parts bits are ok, I beleive the problem to be the power supply on the drives board.
It's something I briefly explored a few years ago, SPARKY, but having no electronics training, it went no further than the initial curiosity stage. Apparently each PCB can be individual to each drive. Check this out click here it might give you some ideas.