i have a little older pc, 1.1 athlon xp with a geforce mx 440 videocard. About 2weeks ago i thought the hd died and didn't use it till the other day. i turned on the PC and it booted fine. I formatted windows and after about 20minutes of being it the screen became really jumpy. Its hard to explain, but about 1inch from the sides and then about half of an inch from there it just jumps. It can't be the monitor bc i have tried on 2 different ones. So any on what might cause this. I have never seen it be this bad before.