lashmk 0 Newbie Poster

I have a KDS laptop that won't start up. When I press the button the LED's & screen just flash very quickly and nothing. My guess was a bad power button board so I took it apart and removed the power button board but it had no obvious damage to it. So I reinstalled it and put the laptop back together and it came on and ran for 1 1/2 hours then suddenly went dead. Now I can't get it to come back on. Any info would be greatly appreciated.