MSI P4M900M2 Series User Manual page 82

Test Speakers
You can select the speaker by clicking it to test its functionality. The one you select
will light up and make testing sound. If any speaker fails to make sound, then check
whether the cable is inserted firmly to the connector or replace the bad speakers
with good ones. Or you may click the auto test
each speaker automatically.
Front Left
Side Left
Rear Left
Realtek ALC883 / ALC888 Audio
button to test the sounds of
Center
Front Right
Side Right
Subwoof er
Rear Right
B-15