Computer blue screens if anything is plugged in

I've had issues with my computer for some time now, not a single repair shop could help me identify the problem, until today.

I went to pick up my computer and the repair guy said, it was running for 3 days in their shop with no issues.

The issue was that my computer forze and blue screened randomly out of nowhere, I though it was the motherboard, CPU or RAM. He told me it might be devices that are connected to it when I use it at home, so here I am testing all of the devices. Plugging them in and out, I ended up with nothing but my display connected to my GPU and power supply. I had to disconnect everything else in order for my PC to stop randomly crashing.

My question is, are the ports on my motherboard really all faulty? Is there a fix that doesn't require a new motherboard? And what can I do? I don't know how this didn't happen at the repair shop.