ZE4500 Laptop Suddenly died, lights out, no sign of life, boo

Hey everyone,

My laptop (i'm not sure the make or model matters) suddenly died, it was working fine one minute, left the room for around 30 seconds, came back and has seemingly has no power. The machine has been running purely off the power adapter because there is no battery. There's no lights on, indicating an electrical connection; it's completely dead. I used a phase tester to confirm a good power adapter, so the problem seems to be with the computer. I don't think the electrical input socket (?) is at fault cos it's not loose.

Does anyone have any suggestions? Maybe it has something to do with that internal coin-shaped battery?

I'd really appreciate any help because i'm completely at a loss as to what i should do next...

Thanks!

Could be a dry joint on power connector, underside motherboard try wiggling to see if you get some response, coin battery is only to retain CMOS information.