Question Stopped working after theme change, and won’t boot

Nov 28, 2020
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Hello,
I’ve just built my 1st PC, aorus elite 570, 5900x, 6800xt, 32gb trident z, Samsung 1tb ssd m.2, WD 4gb hhd.
I had to take it to the store for a bios update.
Today I got it back, installed Windows and some drivers, then changed theme to black and and then background as well, as I did that everything started BUGGING hard, task bar appearing and disappearing.
I turned off power, after restart the MB takes forever to do something, either boot or enter bios, 6x slower than before, and my ssd was changed to 2nd to boot after hdd, and wouldn’t change back, now it doesn’t even appear in the bios(ssd)

Does someone have an idea?
I was really hoping I could play Cyberpunk
Guess it ’s not happening this year