Microtek 710S User Manual page 14

The LCD monitor is designed to work with a range of compatible video
adapters on the market. Due to the possible deviations between these
video adapters, you may need to make some adjustments to fit the monitor
for the adapter being used.
1. Activate the OSD screen by pressing any OSD key. A screen similar to
the one below will appear; the highlight bar will depend on the OSD
key you are using. If you press the & keys, the bar will be at the
volume item.
2. Use the & key to move to the item to be adjusted, then press the
key to select the item for adjustment.
3. Use the & key to change the value of the item to be adjusted.