Hp Laptop problem

Question

Customer of mine brought in a hp laptop. O/S windows vista. It will power up when the power button is pressed. Fan to the processor kicks on for only 20 seconds and then shuts off. The lights on the keyboard are on. power light on. wlan light on. no caps or num lock. screen is black no sounds of the processor clicking or harddrive being accessed. CD rom will open and will make noises associated with the cd spining. any thoughts?