It seems to me that if you're going to do something that violent, it would be easier to pitch yourself and your computer together off the roof of some relatively tall building. In any case, beating yourself with your computer probably wouldn't work, because if you didn't get a fatal blow right away, you'd just knock yourself out. On the other hand, the insides of a monitor are highly toxic, but I'm not sure if it's "kill you instantly" toxic or not.