I bought a new computer sometime on February. It's got the works! (Unfortunately I don't have any details to give you as the papers are back home and I'm a long way from home right now)

But I have had this problem for some time.
Whenever I start playing a computer game at some point (5-10 minutes after I have started) the computer will suddenly crash, the screen goes blank and it won't react to anything, unless I press the reset button. Most of the games I have played are downloaded from torrent and it has also crashed on at least one authentic game, but the craziest thing is that it will play some games without ever crashing, both torrent and authentic (Bioshock for example). Although the previous games don't bother me that much I'm afraid it's going to have the same problem when StarCraft 2 comes out!!!!

I have asked my friends, they don't know and they think it's the games' fault (all of them though?).
Do you guys maybe know? Has this happened to you before? Any help would be greatly appreciated!

Waitwait...
Your screen gets dark and the monitor sets to "standby"?
doesn't also your keyboard and mouse react?

I had that problem, too...
there was a cable elicitod (I searched the word up in dict.de [so I don't know if it's right] whatever: the cable isn't correctly in his "slot" where it should be)

That's exactly it! It goes on stand-by and nothing reacts and I have to reset the whole thing again. So you think that the cable is in a wrong slot?