Question Screen won turn on after thermal paste replacement ASUS ROG GL503VD

Jun 16, 2019
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So after replacing the thermal paste on my laptop the screen wont turn on. i brought it to a laptop service place my place recommended and they said they cant find anything wrong with the cable or the mainboard. everything works fine just the monitor is not working i tried an external monitor and it works, any idea how do i get my laptop monitor running again, and no i didnt damage the monitor all i did was replace the thermal paste