Dell UP2414Q Monitor - Manual (Page 46)

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Operating the Monitor
B) Monitor fails to show any content (blank screen)
1. Press OSD button to invoke the Input Source OSD menu.
Preset Modes
Brightness/Contrast
Input Source
Menu
Exit
2. Use the or button to highlight DisplayPort or Mini DisplayPort.
3. Press and hold the button for approximately 8 sec.
4. The DisplayPort configuration message will appear:
DisplayPort 1.2 ?
Dell UP2414Q
Enable
Disable
5. Use the button to enable DP1.2 or button to exit without making
any changes.
Repeat the above steps to change the setting back to DP1.1a if necessary.