Hp not turning on

[microcompiter]

Hi i have an hp laptop that suddenly doesn't turn on at all.
Can someone help me out?
I've changed the ac/adapter, battery, but still the problem.

 

[Marshillboy]

When you plug it in, do any LEDs at all on the unit light up?

 

[microcompiter]

When you plug it in, do any LEDs at all on the unit light up?

nope nothing