H61m-p23 (B3) doesn't boot, 4 beeps

Hey all:
I'm having trouble booting my H61m-p23 board. It's been used before with a sandy bridge processor (i5-3500k), but I'm not sure what BIOS is on it.
It sat in an anti-static bag for 4 months in a box, now i'm trying to use it with:

Intel Celeron...