I can't use prior experience to see if this is some well known model with issues or not.
I'd try a new motherboard next.
I had a heat problem in my acer laptop. My amd processor would shoot upto 100 degree Celsius and eventually would turn off. To solve this problem, i cleaned old layer of thermal paste from my heat sink and added new thermal paste on CPU. After applying new thermal paste, my laptop now turns on for couple of seconds and then turns off.
Also i am not able to start my laptop without battery. Laptp don't show power LED on when i remove my battery.
Please advise me how to solve this problem