hp notebook pc 2000 is dead :(

hi i have a dead laptop, the only light that turns on is that one from the adapter when i pluggit

there's no other sing o electricity when i press the ṕower button

i already open it and nothing is disconnected

i have a multimeter, what tests can you recommendme before i buy a new motherboard?

I already tested the button with the continuity beep sounding only when i pressit and make a contact between the 1st and 3rd contact in the ribbon cable, but in the 4th and 6th contact the beep sounds even if im not pushing it, is this normal? maybe because of the light that comes in the button?

im still learning trough internet to repair computers, and i bought an multimeter, what other tests can i do to the motherboard?

i ve been searching for information or videos but there arent many of laptops, but i cand upload images of the motherboard if someon cand help me?

thanks i hope you have understood my english im still learning!, thanks for your time.

the model is hp notebook pc 2000, and i still dont know what could happened to this laptop because it was fine before this happenned.