It goes "low, low, low, low, low, low, low, low, high, high-high, low, low, low, low, low, low, low, low". That's 8 low beeps, a high beep, a double high beep, and 8 more low.
Nothing's displaying on my monitors. Motherboard's an old Gigabyte one, but I'm not sure about the BIOS.
A quick check inside didn't reveal anything obviously wrong. All the components seem to be well-seated. I moved it to a friend's house and back recently for a game jam,/