No longer connects to external monitor via HDMI (and other issues)

Hello all,

A while ago, I used this laptop (Acer Aspire E5-575G-76YK) as a main laptop, up until the plastic back of the screen started to form a crack, so the screen was removed. I used it for a bit with an external monitor until it eventually altogether stopped connecting to HDMI randomly, I tried different cords, different TV's, different settings and none of them connected.

The laptop has been dropped numerous times, and has been sitting around somewhat disassembled (it does not have the bottom on it). It also has an issue with connecting to WiFi, it detects it, but it connects with only 1 or 2 bars and often disconnects. Alternatively, I have tried using an Ethernet, and it had a similar result- bad connection, and it often disconnected and didn't work at all.

The laptop is basically completely useless at this point, so I'm wondering if this is an easy fix.

It hadn't been dropped, or noticably damaged, recently prior to the HDMI not working.

The original screen still works (to my knowledge), however I do not know how to reconnect it.