I got this coputer from a girlfriend it was a 256. she had the computer on all the time so when i got it from her she sd ater reinstalling windows it would fix the problem so i went and got a new hard drive and added new ram to make it a 512 and reinstalled windows after doing so the same problem happens it shuts down but the power is still on the computer. this morining before i could even the admistrator pass word in it crashed. around christmas though i used it and this problem never happened. does anybody have a clue on what it could be?