Computer Won't Switch On.

[10ClarionSt]

I turned my pc on, it started up, then it just went off. Now it won't switch on. Could this be the power unit or the on/off switch? Or maybe something else? Any help appreciated. Thanks.

[VHG]

It could be anything.

It could be the power supply, the on / off switch, a blown fuse and so on.

From what you have said it is hard to be more precise.

[anaxcrosswords]

Have you tried switching it off and back.... oh.

Like VHG says, any number of reasons, although if it switched itself off it's probably not the on/off switch (which would usually be a mechanical failure that would only manifest itself when you press the button).

[Old_Geezer]

Power supplies can turn off if they sense a problem. Try turning on again after an age unplugged and see if it does its start and then off again cycle.

[TTG]

Try changing fuse on the power lead plug. Always look at the simple things first!