I have a problem over the past month and a half my computer will turn on and boot up perfectly fine. But after about 4 or 5 days I will go to work on the computer and it is still on but the operating system is not running. I have checked all the wires and cords inside and everything is in securely. The hard drive that I have is 4 months old and it is brand new. I will not be able to get the computer to boot up again for about 4 or 5 days. Then the same thing happens. I have had one of my friends who knows a lot about computers look at it and he cannot find anything wrong with it. Please HELP.