Laptop doesnt turn on

2 weeks ago the hinges on my Acer Aspire E1-571 broke completely and i tried to fix them, however one screw was stuck and I had to apply pressure which broke a small part on the top case near the power button. The broken part was just plastic so I dont think i destroyed anything. After fixing the hinges, I reassembled the laptop but it didn't turn on at all. However it did turn on with the battery so I knew the problem was with the dc jack - one cord was cut. I had to buy a new one, which I got today but the laptop still doesnt turn on. This time even with the battery which is weird cause it did turn on with the battery and I havent touched the laptop since that time. Also I changed the thermal paste today- dont know if that matters.

By the way since I have 2 acer laptops and they use the same charger, to test the broken laptop I take the charger from the good one and after that the charger doesnt work on the good one too. I have to completely unplug it 2-3 times until it works again