If you upgrade any parts in the machine (graphics card, mainly, but extra hard-drives can also play a part), then a lower-powered PSU could have a chance to brown-out (ie. temporarily not supply enough power to all devices).
Hmmm, that'll likely be the reason then, added an extra drive a couple months back
- Best get it sorted asap, a machine's psu @ work went bang today in a big way!
