I have been having this problem for the last month or so. My computer starts up fine now if i go on the internet lets say and start down loading or watching a movie the comp restarts. I tried playing a game same thing happens. When it sends a message to microsoft i have gotten two differnt ones , one says that i need to upgrade bios and the other one said there might be a problem with a hardware but doesn't tell which one. I have cleaned out the dust from fans a what not, i have two sticks of ram i took them out and checked to see if that was it. no luck even if i leave the comp on without running any apps it stll restarts on me. pls help i think i can fix it dont have the money to pay to get it fixed plus i like to know what to do.