i think thats a intel board.
have a look on the motherboard for a number that starts with "d "
look round the pci slots and memory slots. if you find it see if you can then match it up here.
http://support.intel.com/support/mother ... ne_p4p.htm
now most of these intel boards had onboard sound but 9 times out of 10 it was not realtek but intels own.
if you find a match please post it back here and i or someone else can then do a little digging on the board number and find out what is onboard.
if you still can't find anything try using everest on the board aida32 is ok but it is nothing more then a copy of everest.
that program can be found here.
http://www.majorgeeks.com/download4181.html
if all else fails i may ask you to look for the sound chip on the board but lets just try the above first.