Not sure if this is a good question to ask...
I acquired a Dell M6800 laptop that was considered bad or dead. Little troubleshooting was done at the time it was sent to the waste pile. I understood it to be a bad motherboard. I brought it home and put some RAM, disk drive in and attempted to turn it on. One of the diagnostic lights would flash on for a split second and then the machine would just remain off. I replaced the motherboard with an eBay replacement. The result was the same. I replaced the DC jack cable since it would seem the machine wasn't getting power.
The result: More diagnostic lights, remaining on, and the CPU and GPU heatsinks warming up. No fans, no other power. I double checked RAM spec as it seems this model will only work properly with DDR3L. Making sure that was correct caused a couple lights to go off. Even on just the battery, the result is the same.
The only diagnostic light that is on is the power indicator light. It comes on and remains on as long as the battery is connected or plugged in with the PS. The heatsinks for both the CPU and GPU warm up, as if they are running. The manual doesn't have any troubleshooting for this kind of error/problem that I can find, the light codes don't have a issue for only power light on.
Could my replacement motherboard be bad?
Has anyone seen this kind of failure/problem before?