On-board Sound problem with P4C800-E Deluxe

This may well turn out to be a no brainer, but figured I would ask anyway. I've got a ASUS P4C800-E Deluxe with an overclocked CPU in it. I was trying to use the on-board sound, but apparently anytime you overclock the motherboard it doesn't work. Is there anyway to get it working or am I just going to have to get a add-on sound card?

Thanks,

Chris