Laptop booting problem

Hello,
i was working with my compaq hp nc6000 computer ,i dont know what really happened for i have never experienced it before,the screen just went off but there was indications that the computer was still working as all the link lights were still on.i put off the the computer and on it again,but just start booting and the screen will not come on and it will stop.please help diagnose the problem for me.you can reply through the email address.