If the suggestion from ABCellars should not work, you might want to check on this.The problem could be the motherboard, and the symptoms including loss of bootup, VERY slow bootup, WiFi stops working, etc. is simply that the MOBO board overheats and fries the video driver chip. The cooling design of this PC is inadequate. Short of replacing the motherboard I do not believe that there is much that you can do. Here is something that you might try if you are up to itwill not power on... Even if you get a new MOBO you might have the problems again for as long as it has the NVidia chip. It is my understanding that there are now revised board out that have the ATI chip and do not have those issues. Good Luck