I'm using a BIOSTAR 790GX AM2+.
So, update: I got a DVI to HDMI converter from my friend, booted up the PC, nothing on my screen (just black). I removed the video card entirely, still no luck. I've attempted to boot with one stick of RAM, no luck. At this point, I don't know how I can further simplify the system. I'm thinking something might have gone bad, but everything is new and lit up and whirring so I'd like to think it's something I've done wrong.
Edit: What should I expect to see once it works? My manual says to press F12 to access BIOS, and I am doing that (repeatedly), but maybe the black screen is somehow normal? I've never built a PC from scratch before...