bricked motherboard

Hey y'all, real lost on this one. I did a BIOS update this morning on my PC to bring it from BIOS version F13i to F20a. I downloaded the update file from the Gigabyte official page for the Aorus B550I Pro AX motherboard, and plugged in an NTFS USB drive to flash through the BIOS. I loaded up...

fixing up an older motherboard for a friend, they did some "tinkering" and now I'm trying to boot it up again but I get no post. The system turns on but there is no video output. specs i5 4460s gtx 680 2x8gb ddr3 hyperx fury 500w powerspec PSU I have already tried shorting the bios reset...

I got a MSI Z370 Gaming Pro Carbon from a friend who attempted a BIOS update so it could run a 9th gen chip. He said it said it completed, when it rebooted the screen was black and that was the end of it. It's now in my possession. I noticed 1 bent pin in the socket, fixed it with a sewing...

A sequence of issues has ended up bricking(?) my PC. I assume this a BIOS issue but I am not sure. I'd be very grateful to anyone who could help me resolve this problem, or even just explain why this has happened if a solution is not available. Much more information below: Running Windows 10...