Okay, I've never played on PC, but I've done courses on PC games. I'd say first, check your Graphics Card is working, then find out if it's compatible with the new motherboard. If it's not, get parts that are compatible.
If all the above are working fine and are compatible already, check the internet disk tray, try other games, then see if it's actually the disk that is corrupt.
In a case you've done all these, message either Steam or an FAQ site, and ask for help. There'll be some technological wiz on there.
Hope this helps.