Hello, my pc won't start...when i push the on button it beeps and then the screen said no signal...how do I fix this problem? The computer is a HP Pavilion Media Center A1677c with a motherboard from Asus named A8M2N-LA. HP motherboard name of NodusM3-GL8E. It gives me a 2-3 second long beep, then a 2-3 second silence, before it repeats itself. What does this code represent?