|Out of curiousity, why did you switch to this board? It's not very modern.|
Did the sound work OK on your friend's computer? Are you sure the speakers work & are connected to the right audio-out port? Did you try headphones? Did you connect the sound to the front audio-out ports on the case?
I just found this in your motherboard manual, do you have a copy?
MSI Reminds You...
If you do not want to connect to the front audio header, pins 5 & 6, 9 & 10 have to be jumpered in order to have signal output directed to the rear audio ports. Otherwise, the Line-Out connector on the back panel will not function.