Unhelpful post: Sounds like some weird kind of bios/motherboard issue. Your computer works once started so it's obvious that functionally it's fine. Unplugging it for extended periods shouldn't affect anything except some bios storage, which would make sense that something is being saved incorrectly since a fresh boot (likely redetecting your hardware from scratch) comes up just fine. I'm on my phone so I can't really search well at the moment, but you've tried replacing the bios battery, right?
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