Black screen will not boot up. HP PAVILION DV2000 will not boot up. When i press the power button

Question

HP PAVILION DV2000 will not boot up. When i press the power button all lights come on but laptop will not boot up.the laptop dont boot up, i did all you said and plus i disconnect the CMOS for a couple of minutes it boot up once i suth it down a try to boot it up and didnt work. what i can do?