70% of the time my PC's fine and works normal, but sometimes it won't turn on and I have to keep unpluggin and trying again - it usually gets going again when I lay the tower on its side, motherboard nearest the floor if that makes a difference.
Its worked fine for over a year up until the last few weeks so I reckon its due to one of 2 things
----> A few weeks ago my tower was smoking and on closer i inspection
it was an interior wire that had frazzled. I presumed this was either
due to the ageing (and increasingly noisy) processor fan or the fact
that the PSU is 500W when I don't really need that much - hence
again either too hot or too much power flowing through. So I plumped
for a new processor fan (Arctic Cooling Freezer 7 Pro 775Skt). Could
this change have caused it???
----> The other option is of course any longterm damage done by the burnt
wire. I think that the wire that burnt was the one from the motherboard
that lead to the front of the case and causes the beeping whent the PC
starts, etc. So judging that it wasn't essential left it unplugged
When its playing up it comes on for 1-2 second, I hear the fan start, the screen doesn't come on, there's no beeping (but if the burnt wire is the one I think then this is to be expected anyway)