Dell U4021QW Users Guide - Page 74

Product specific problems, Troubleshooting, NOTE: Thunderbolt, is not supported Windows 7., Problem

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Product specific problems NOTE: ThunderboltTM is not supported Windows 7. Problem What you experience Screen image is Image is too small centered on screen, but does not fill entire viewing area Cannot adjust the monitor with the buttons on the front panel OSD does not appear on the screen No Input Signal when user controls are pressed No picture, the LED light is white The picture does not fill the entire screen The picture cannot fill the height or width of the screen No Video or No video when display on HDMI connecting port docking, dongle or Blu-ray DVD players Possible solutions • Check the Aspect Ratio setting in the Display menu OSD. • Reset the monitor to factory settings. • Turn off the monitor, unplug the monitor power cable, plug it back, and then turn on the monitor. • Check the signal source. Ensure the computer is not in the power saving mode by moving the mouse or pressing any key on the keyboard. • Check whether the signal cable is plugged in properly. Connect the signal cable again, if necessary. • Reset the computer or video player. • Due to different video formats (aspect ratio) of DVDs, the monitor may display in full screen. • Run the built-in diagnostics. • Due to legacy platform cannot recognize or output 5120 x 2160, we suggest to switch to lower resolution to cover this compatibility problem: 1. Remove all input cables, press and hold Up or Down or Left or Right direction for 4 seconds . (Please refer to Built-in Diagnostics for button numbers) 2. Choose "Enable" on POP up screen to change max resolution from 5120 x 2160 to 3840 x 2160. 74 | Troubleshooting

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Troubleshooting
Product specific problems
NOTE: Thunderbolt
TM
is not supported Windows 7.
Problem
What you
experience
Possible solutions
Screen image is
too small
Image is
centered on
screen, but
does not fill
entire viewing
area
•
Check the Aspect Ratio setting in the Display
menu OSD.
•
Reset the monitor to factory settings.
Cannot adjust
the monitor
with the
buttons on the
front panel
OSD does not
appear on the
screen
•
Turn off the monitor, unplug the monitor power
cable, plug it back, and then turn on the monitor.
No Input Signal
when user
controls are
pressed
No picture, the
LED light is
white
•
Check the signal source. Ensure the computer
is not in the power saving mode by moving the
mouse or pressing any key on the keyboard.
•
Check whether the signal cable is plugged
in properly. Connect the signal cable again, if
necessary.
•
Reset the computer or video player.
The picture
does not fill the
entire screen
The picture
cannot fill the
height or width
of the screen
•
Due to different video formats (aspect ratio) of
DVDs, the monitor may display in full screen.
•
Run the built-in diagnostics.
No Video or
display on HDMI
port
No video when
connecting
docking, dongle
or Blu-ray DVD
players
•
Due to legacy platform cannot recognize or
output 5120 x 2160, we suggest to switch to
lower resolution to cover this compatibility
problem:
1. Remove all input cables, press and hold Up or
Down or Left or Right direction for 4 seconds .
(Please refer to
Built-in Diagnostics
for button
numbers)
2. Choose “Enable” on POP up screen to change
max resolution from 5120 x 2160 to 3840 x 2160.