Shoutbox

My local server machine is having some issues. It is almost 5 years old now, so I'm not terribly surprised its dying. On Tuesday night, I rebooted it, and it decided to not come back online. The power and HDD LED's light up (and the HDD turns off after a minute or so), and does not POST, no display on screen. I tried removing components, to see if something had failed, but no change. Went to the shop the next day and bought a new PSU to see if perhaps that was the cause. It was not. One difference with the new PSU is that the power light on the front of the case does not light with it. The old one also has a high pitched whine noise to it whenever it has power to it.

After some experimenting between combinations of components and PSU's, I finally managed to get the system to boot, and only does so randomly, maybe 10% of the time. It needs to have monitor, LAN and KB plugged in, and the psu needs to be switched on but not powered on for a few minutes before attempting to start the pc.

Anybody know possibly whats going on? Yes I know its possible hardware failure, but I mean more specifically.