I have an Asus P5KV + E6500 + DDR2 + Cooler Master 550W PSU + LCD. The motherboard has a built-in video. When I turn on the power, the CPU fan rotates, the monitor says no signal. After a silence period of 15 seconds, the system speaker has a short 'doob' sound, and the LCD says having signal. but there is still no display on the screen.
LCD and video cable are proved OK. Connections have been carefully checked. The E6500 is just open from the new package-box. The P5KV + DDR2 + PSU have worked together harmoniously in the last three years.
Does the symtom shows that the CPU is properly functioning, and that the PSU is the most probable trouble-maker.