I have Compaq v2710us. When I start it, the light in front just quickly flashes at me. That's it. No fan, nothing!! If I try again, not even the flash. If I remove all power, reinstall it and try again, it just winks at me again. I have replaced the mother board and the central processing unit. Nothing, except once it started the fan and it cycled on and off. Then it stoped.