Incendiary motherboard
Shortly after fitting a new, high-powered graphics card to my computer I had a few problems with the card cutting out and the computer re-booting.
I checked (again) that the card was seated properly, the external power cable connected properly and the fan turning. All seemed ok so I assumed that it was a driver problem.
The computer then ran for about 20 minutes before switching off.
I touched the card to check that it was not overheating then switched the computer back on again to continue downloading new drivers. Fortunately I left the side cover off.
About 1 minute later I noticed a warm, flickering light reflecting off the back of the case and looked inside to find the motherboard on fire around the power connector.
Has anyone else had a similar problem?