HP Pavilion DV9500 Won't Power On

I was asked to repair a laptop for my father this week. He said he was using it just fine the other night and left it on. In the morning he found it off and would not power on (no lights, no sounds, no anything). It's as if the power button is not responding. The power cord when plugged in, illuminates blue which is supposed to indicate power being received.

Searching many forums and google I have noticed most people claiming the HP DV9000 series were recalled, but most people get their quickplay lights to turn on and hear their computer (fan, hard drive, etc). I can't get ANYTHING. I have tried multiple hard resets and compressed air dust removal with no success.

At this point I feel like it could be a motherboard issue, but I don't know how to be sure and don't think it's a smart idea to insinuate the problem is bigger than it is, as it's usually not. I am in the process of borrowing a power cord to rule that out. I also am going to try to double freezer bag the laptop for a few hours as that has worked in the past and seems to solve several issues at least temporarily with laptops.

If you guys know of any other tests I can do with no power at all for the laptop, please let know! I really would like to fix this without telling him to just buy new parts, especially when I am still not 100% sure what the issue is.