Compaq Presario - Power Failure

Alright, I do a lot of local repairs, mostly removing virus, home/small business network installation, transfer HDD's, etc, but I have this one client whom laptop will not turn on.

Any suggestions? I took the RAM out and put it back in and it too didn't work. Even tired with the HDD as well.

I checked the power adapter and it sounds like it works. It doesn't have a power light for some odd reason. But when I plug it into the computer, no lights come on.

Give me ideas if you can!

Thanks