Product Specific Problems - Dell UltraSharp 25 Series User Manual

Product specific problems

Common
symptoms
Screen image is too
small
Cannot adjust the
monitor with the
buttons on the
front panel
No Input Signal
when user controls
are pressed
The picture does
not fill the entire
screen
No video at HDMI/
DisplayPort/USB
Type-C port
│
68 Troubleshooting
What you
experience
Image is centered on
screen, but does not
fill entire viewing
area
OSD does not
appear on the screen
No picture, the LED
light is white
The picture cannot
fill the height or
width of the screen
When connected to
some dongle/
docking device at
the port, there is no
video when
unpluging/pluging
the Thunderbolt
cable from the
notebook
Possible solutions
• Check the Aspect Ratio setting in
the Display menu OSD.
• Reset the monitor to factory settings.
• Turn Off the monitor, unplug the
power cord, plug it back, and then
turn On the monitor.
• Check whether the OSD menu is
locked. If yes, press and hold the
Menu/function button next to the
Power button for 4 seconds to unlock
(for more information, see Lock).
• 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. Re-plug the
signal cable 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.
• Unplug the HDMI/DisplayPort/USB
Type-C cable from dongle/docking
device, then plug the docking
Thunderbolt cable to the notebook.
Plug the HDMI/DisplayPort/USB
Type-C cable 7 seconds later.