QUOTE" 剛開始沒事，也許10分或1小時後才又出現音效連接阜沒有抓到喇叭而且一直出現另一黑色孔跳動，將其設定後，還是一直出現，即使不使用M800看第4台也有問題，

one person went through this, he sticked a heat sink to south bridge,[sound chip overheat]
if you open the side panel and blow the MB with a big desk-fan, see what happen to the sound, if it last longer, then it is heat related.

CPU INTEL 630 +VGA 技嘉6600 DP+電視卡 M800>150W HOT