Poor thermal paste would not stop the laptop from starting up.

Hello, in this pc you Can add a secondary ram ? Exemple 2x4go

dear my laptop is acer es1 572. problem is its wont power on and not even charging, no power or charging led indecator show. while i try to repair it a little burning smell was blown for just a secound and after that its totally dead(no led indicator light up). but i belive the motherboard can be fix. what can i do for this setuation, please kindly give me some suggestions.

Nice video but you failed to go beyond that component so for those of us who might be having a different problem it is limited. But thank you all the same.

i changed the termal paste, disconnect bios battery and ram, waited a moment but still nothing happens