I just received an American Megatrends error message stating: CPU Fan Error! Press f1 to Run Setup; however, when I press f1 I CANNOT enter setup. Also, when I tried starting a warmor cold start the ASUS displays a message to press F2 or DEL to enter setup, but neither of these will allow me to enter the Setup screen. The PC has been running for months without any problems and nothing has changed. Any ideas would be much appreciated.