You're going to have to be a bit more specific.
AK31A has a plethora of issues, I'll give you a few things to look at:
- CPU core voltage. Each and every AK31A I've used has had the core at 1.66-1.68, rather than 1.75. Depending on the chip, it may need the full 1.75 volts to maintain stability at its rated clock. Try using one of the +0.xxx settings to get it at or even slightly above 1.75v.
- RAM. Check your timings and options. If you're trying to populate all 4 slots, forget about it. This board is terribly unstable with 4 DIMMs, no matter the make. Try very conservative timings and work down. Try 2T command rate rather than 1T, particularly with 2 or 3 DIMMs.
Try using just your video card first, removing all other PCI cards. Also, check your power supply.