New
#11
I'm ashamed to say that I had forgotten I had posted this problem here! I should have updated it with the simple solution that worked for me. Update the BIOS! On my Acer laptop, that fixed it immediately. The latest version (in my case) is 1.08.
Hope that helps you! If it doesn't, then I would suggest contacting the forum of the manufacturer of your computer (or motherboard, at least). That's where I got my answer.
Graham