Thank you both for replying. I really appreciate you taking time out of your day to try and help.
Yes, my dad was the one to build the PC, but he is currently out of the country so I couldn't get an answer to your questions (and had no idea myself). I actually reached out to MSI support for help, and they were able to talk me through a few steps that helped me fix my problem. I'll quote their reply here, in case anyone else runs into a similar issue.
"Regarding your concern, in this case, please unplug all the components and devices on the MB, and then reinstall the CPU, RAM(one piece in DIMMA2), VGA card and power supply only. Then unplug the power supply and CMOS battery for a while to check it. if it still cannot help, please check if all of the power connectors on the MB and VGA have been connected to the PSU normally. Also please check if there are any bend pins on the CPU. In addition,we suggest you wait for a moment as the boot time of this MB is a little long."
I followed their first suggestion (removing everything then putting all of the essentials back) and I was able to load into the BIOS! I think the issue was either my RAM being in the wrong slot, or a few wonky PSU cables.
I ran into another problem after, with my OS, in that Windows would not boot and I would get a blue error screen. The computer would then restart. I took this problem to them too. I'll post their response here, in case anyone is interested. Once again, it worked for me.
"Your motherboard is effectively compatible with win7, you have a blue screen because your old SSD is configured for your old motherboard, so the chipset and parameters are all different. This is why you have this message. You will need to do a test by completely reinstalling win 7, backing up all of your data beforehand." (Translated from french)