1. Replace the CMOS battery.
2. Remove power, battery, press and hold the power button for 60 seconds, release then test.
3. If failing what can we do without? Don't need the drives, don't need the WiFi module, what else can go?
Some don't want to try the battery replacement and it's so cheap here (under 1USD) that we always give it a shot. Some want assurance that this will fix it so I can write no to that.
A sure fix is to get a working model and use the best parts from both. Like:
When I try to power on this laptop, the power button and accompanying panel light up and then power off. For reference, here is a video of what that looks like:
This is with the HDD and one stick of DDR3 RAM in place. Same results with battery in/out and adapter plugged in.
The reason the keyboard is missing is due to me removing the heat sink, cleaning off old paste, and applying new thermal paste. I thought that might make a difference, but it didn't. Same issue before and after.
Could this mean a new motherboard is needed? I received this laptop as is, I'm just seeing if I can fix it up as a mini project.