My PC just exploded

It can't be all good, can it? When a few days ago my computer suddenly started restarting itself whenever I load sims, I thought something was wrong... When my father checked it out and said it "seems that nothing is wrong and nothing is overheating" and it stopped happening I thought it was just something with electricity (happens a lot). But just 10 minutes ago when I was finishing writing Part 15 of Strangetown chronicles (and of course only about a half of my hard work was recently saved) I heard something explode and from the sudden black screen in front of me I realised it was my computer... Well hooray, it just HAD to happen on a friday evening. My father says it's the supply unit... At least it's not the graphics card, thank you for that much... So now I am writing it from my laptop, which is way too crappy to play sims on, and even if I could, everything is on my main computer... Including the story that I ALMOST finished... This being said, it's 2am in here now, good night and sweet dreams everybody. A very nice way of telling me "go get some sleep instead of wasting your time on sims all night". I'll keep you posted...