I need motherboard replacement advice for my desktop.
Backstory and Problem
I was reinstalling a Hyper 212 Evo and put the mounting plate on wrong. When tightening the nuts on the back of the board the back plate for the radiator pressed against screws sticking out of the motherboard. Also, the entire system is mounted to a pegboard on the wall with twist ties. There was board flex when I was removing it prior to installing the radiator. The power supply is good after testing. The fans do not spin up and the Ethernet port LEDs do not light up. I do not have a way to test the CPU. There is no video signal.
I would buy an LGA1151 Z390 for $100 from Microcenter but I need a TOSLINK port to drive my 5.1 surround system. That gives me only two $180 options.
Should I buy a used Z170 with a TOSLINK port for about $75 on eBay or a new $100 Z390 and pick up a sound card (maybe a Vantec 7.1 Channel PCIe Sound Card) with TOSLINK for $40 later on?
If my motherboard is fine somehow and the issue is something else, I can't return the eBay purchase. If I buy new with the option of returning, I am worried about spending money on a motherboard with an old socket. If I do upgrade my system later, I won't have to pick a board with an optical jack because I will have the sound card.
I don't game any more and don't intend to upgrade my desktop any time soon. I have a server and a laptop so I'm not without a computer. Thank you for your advice.