Relative's Compaq Presario 1200 laptop quit working.....power on and power light comes on...no beeps or display...nothing. Can put in CD and it will spin, but no display or sound...nothing. If leave on long enough the cooling fan will start running.....Whats Up??? anyone know...dead hard drive, cpu, motherboard or what. Local store wants $60.00 just to diagnose........How can they diagnose if nothing working????.........HELP