Thats nothing to worry about, I've done much worse. Its very, very hard to programmaily damage the hardware of a computer, even then, you would need to find a really obscure bug that would cause a lot of damage, e.g. thermal runaways, although that is not impossible. I have a zotac ITX motherboard that has a core2quad and thermal runaway, which I try to manage as much as possible. Its not a bug, its just my setup (and yes, that can cause thermal runaways, your setup, smaller cases = hotter, restricted airflow = hotter. Both found in cheap cases, I.e. the less than £30 or so price range.).
And if that isn't bad enough, I have broken a Playstation 3, which wouldn't be soo bad, if:
It didn't cost £13,000 per unit(!)
It wasn't one of the few dev kits a university had, they had 10 of them, one I was using, just had to break when I compiled something with the YLOD.
It was 2 weeks old when it happened.
It was luckily a warranty repair, so I got off lightly. Even now though, despite costing huge sums of money, I have to joke about it, because I was using it and although the hardware broke, it was jokingly my fault.