Well, I have just been playing Titan Quest and I got that sickening pop sound of something going wrong electrical coming from the PC.
I opened the case and can smell the horrid electrical burn smell but for some bizarre reason (thanfully also) everything is working just fine.
When I opened up inside it was extremely hot, so left the case open to let it all cool and fitted my twin fan exhaust to try and keep temps down. Think I need to move the PC down to floor level as it is getting really warm in the house.
Hope it was just some dust or something creating a spark and I have got away with it.