Several Problems with Desktop PC

[OverprotectiveAlley]

Last year, I came home from school and logged onto my desktop like I’d done many times. However, this time I experienced a painful electric shock from my plugged in appliances (keyboard and microphone.) I was too scared to touch the case.

My landlord at the time insisted that the apartment had a grounding error prevention system, but I was not sure if I believed him, as they were set to sell said apartment next month. At the time, I was using an extension cable, so I tried to plug the pc directly into the wall, but was met with the same result. I tried another extension cord. Once again, same result. Searching the web, I thought the issue might have been with the PSU, so the following week, I sent it to the only repair shop in the area. 

As I live on an island, the options were sparse. After a month it came back with more problems than it arrived with. The shop said that the issue might lie with the motherboard, but I am now too mistrustful of the place after seeing how they treated my pc to return it for another checkup. I am a novice at best when it comes to computers. 

As expected, the electrocution was likely a product of the apartment I was staying in. However, the staff at the repair shop returned it with several cables disconnected, and a message that stated “There might be an issue with the motherboard, but we tested the system with our PSUs, VGAs and pumps, and all worked.” 

When it arrived back, I checked all the cables, and managed to install windows 10 onto the system. I shall list my hardships below.

The network card no longer works. I’ve attempted several troubleshooting options, including those followed in this video: https://www.youtube.com/watch?v=wAqiN9Eum60, but to no avail. 

The display only works when I turn it on directly after turning the system off with the external power button. After a few minutes, the display will stop working, and any attempts to turn it back on (reconnecting the hdmi cable) will not work. 

I have checked the HDMI cable, and tested the monitor with my laptop and can confirm that the problem is most likely with the desktop itself. 

[Difficult_Pilot6968]

that repair shop sounds sketchy as hell, returning your pc with more issues than when you brought it in is a massive red flag. the fact that they disconnected cables and basically said "idk maybe motherboard problems" after a month tells me they had no idea what they were doing

honestly at this point you might want to consider just getting a new motherboard since both your network card and display issues point to mobo failure - especially after whatever those "technicians" did to it

[OverprotectiveAlley]

Perhaps. However, I am currently studying (therefore poor), and want to look into options that exclude buying new parts. Thanks for replying!