Dell 5160 laptop won't start

[speedchaser43]

I bought a used Dell 5160 laptop and it won't turn on.
i bought it as a project and I'm a bit lost.
the previous owner said it would turn on with a new ac adapter, so I bought a new one and it still won't turn on.
I've tested the new adapter to make sure it works and it's fine.
Does anyone have any ideas?
Thanks in advance.
speedchaser43

[JJ 3000]

Personally, I'd try to get my money back. If you can't do that, then the next step would be to replace the battery.