Dell S2340T Multi Touch Monitor - Manual (Page 25)

a. Press “ ” button until the brightness level reaches 100 (maximum). Then, press-and-hold “ ” for an additional 2 seconds.
The following message pops up.
b. Answer the prompt. “Yes” to accept change. “No” to cancel and remain in Green Mode.
c. If “Yes” is selected, Performance Mode is turned ON. Brightness level can be adjusted higher if needed. In which case, auto
power saving is disabled.
Contrast Adjust Brightness first, and then adjust Contrast only if further adjustment is necessary.
Push the button to increase contrast and push the button to decrease contrast (min 0 ~ max 100).
The Contrast function adjusts the degree of difference between darkness and lightness on the monitor screen.
Input Source Use the Input Source menu to select between different video signals that may be connected to your monitor.