Fuzzy/glitchy bios and post screen after CMOS reset?

Jul 8, 2018
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Hi,

I recently had a suspected mobo problem where my GTX 1060 was stuck in x4 and wouldn't bump up to x16 under load even though it works fine in my test system, so I reset the CMOS on my motherboard but now when I go into the bios, the screen is fuzzy and momentarily goes black for a few seconds. When windows loads everything is fine and behaves as normal. Any ideas what could have caused this?

Cheers

System specs:

i7 4790
GTX 1060
H81M S2H mobo
16GB DDR3 Corsair vengeance RAM
Corsair CX650M PSU
Windows 10 Home 64
Kingstom 240GB SSD for windows
1TB WD for games