Techie question

[cheekbones3]

Hello all! We've got a computer that's just started switching itself off for no apparent reason - it seems like there's something wrong with the power supply as far as I can tell. Is this a common symptom of a worn-out PSU? And if not, what else might it be? (I'm sure it's not the external power supply equipment, as the monitor doesn't go off.

Comments

[dryriser.livejournal.com]

And as for ease of replacement - about 4 screws and 4 or 5 wires usually, so not too difficult.