Samsung SyncMaster 753Ms, 753v, 750s, 753s Owner's Manual page 43

The sound is too thick.
The microphone is not working.
The sound is distorted.
Check the following items if there is trouble with the monitor.
1. Check if the power cord and the cable are properly connected to the computer.
2. Check if the computer beeps more than 3 times when booting.
(If it does, request an after-service for the main board of the computer.)
3. If you installed a new video card or if you assembled the PC, check if the installed the adapter
(video) driver and the monitor driver.
4. Check if the scanning ratio of the video screen is set at 75Hz or 85Hz.
(Do not exceed 60Hz when using the maximum resolution.)
5. If you have problems in installing the adapter (video) driver, boot the computer in Safe Mode,
remove the Display Adapter at the "Control Panel, System, Device Administrator" and then
reboot the computer to reinstall the adapter (video) driver.
Note: If problems repeatedly occur,
keeping a certain distance from the speaker.
Re-adjust Bass and Treble.
Check to see if the connection cord of the microphone is
connected properly and then try again.
The sound card in your computer should support the
microphone input function. Otherwise, change your sound
card or use a microphone provided with your computer.
Turn the volume down.
Place a magazine or a pad under the stand of your
monitor.
contact an authorized service center.