I just bought a new computer. Its an Athlon 64 3000+. Anyway, it came with a samsung TS-H552U DVD writer. I just loaded a DVD into it and it plays fine, but there is NO SOUND!! now the sounds works fine for other applications, but not for the DVD. Anyone have any idea whats wrong?? It says i have the best drivers installed for it already, so i dont' know what else to do....