OK I have a huge problem with my computer. One day I was just sitting there and I decided to play some Doom 3 well anyways it was on the loading screen and it loaded all the way up but the game wasn't starting I thought this was odd but just waited a minute. As i waited I heard my coomputer start becoming higher and higher in pitch I wasn't shure if this was jsut my imagination or not, but I just sat there and suddenly the computer shut down. After that the computer would not turn on for a bit so I unplugged and from my brother's advice(he works for geek sqaud) he told me to check the motherboard which I did and it was fine. I plugged it in a little while after and it started to run again. Except now when I log in and windows is on for a few seconds it locks up. I think it possibly could be overheating but all of my fans are running. Please help!