Question BIOS screen pixelated on second boot up

Sep 12, 2019
Hey, I built a PC over the past few days as a project for one of my college courses, and I booted it up for the first time in class today and everything went great. I didn't have an iso image for the OS ready at the time, so my instructor told me to just turn it off and take it home to work on over the weekend. Now I'm home and trying to get the BIOS menu to show up so I can see if it will boot from USB or not, but only the top and bottom of the menu is showing, the rest changes from all black to completely pixelated. I've tried resetting CMOS and nothing changed whatsoever and its starting to scare me haha. I should probably mention that I have a Gigabyte B450 Aorus Elite motherboard. Any suggestions as to what went wrong and how to fix it? I'm pretty new to this and I don't want to make anything worse. Thanks!