"Missing Operating System"

You’re not going to get a new motherboard that’ll let you keep your DDR3 ram. 16GB DDR4 of a decent speed can be found for around $100.
Actually Asrock has mobos that accept both DDR3 and DDR4.
 
Whenever I have a system act funny like this and I can't figure it out, I pop in a linux live cd and see how it runs. Some are better for testing than others, but if the things that are missing are suddenly there again--gpus, drives, etc, it may just be a really bad mess of software issues. I don't think this is the case in your situation, but it would help to narrow stuff down a bit for sure if you wanted to figure out what went wrong.
 
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