It doesn't matter if it's enough to power your system. A faulty PSU can cause all kind of problems.xKratosx said:Many thanks again for the replies, pretty certain it isn't a PSU issue, I've used an online calculator and should be running at quite a bit below 300w so it should be fine on that account.
Also have you checked your motherboard for any sign of bulged or leaking capacitors? http://en.wikipedia.org/wiki/Capacitor_plague
Bulged capacitors inside motherboard and PSU was what caused my friend's PC to randomly reboot many times recently!