Dell U2415 Manual

							Troubleshooting  |  61
Product Specific Problems
Image retention 
from a static 
image left on 
the monitor for 
a long period of 
timeFaint shadow 
from the static 
image displayed 
appears on the 
screen•Use the Power Management feature to turn off the monitor 
at all times when not in use (for more information, see 
Power Management Modes).
•Alternatively, use a dynamically changing screensaver.
Specific 
SymptomsWhat You 
ExperiencePossible Solutions
Screen image is 
too smallImage 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 panelOSD does not 
appear on the 
screen•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 button above the Power button for 10 seconds to 
unlock (for more information, see 
Lock).
No Input Signal 
when user 
controls are 
pressedNo 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. Re-
plug the signal cable if necessary.
•Reset the computer or video player.
The picture 
does not fill the 
entire screenThe 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. 
						

							62  |  Troubleshooting
Universal Serial Bus (USB) Specific Problems
Mobile High-Definition Link (MHL) Specific Problems
Specific 
SymptomsWhat You 
ExperiencePossible Solutions
USB interface is 
not workingUSB peripherals 
are not working•Check that your monitor is turned On.
•Reconnect the upstream cable to your computer.
•Reconnect the USB peripherals (downstream connector).
•Switch Off and then turn On the monitor again.
•Reboot the computer.
•Some USB devices like external portable HDD require higher 
electric current; connect the device directly to the 
computer system.
High Speed 
USB 3.0 
interface is 
slowHigh Speed USB 
3.0 peripherals 
working slowly or 
not working at all•Check that your computer is USB 3.0-capable.
•Some computers have USB 3.0, USB 2.0, and USB 1.1 ports. 
Ensure that the correct USB port is used.
•Reconnect the upstream cable to your computer.
•Reconnect the USB peripherals (downstream connector).
•Reboot the computer.
Wireless mouse 
is not working 
or laggingDo not respond 
or responds 
slowly•Increase the distance between the USB 3.0 peripherals and 
the wireless USB receiver.
•Position your wireless USB receiver as close as possible to 
the wireless mouse.
•Use a USB-extender cable to position the wireless USB 
receiver as far away as possible from the USB 3.0 port.
Specific 
SymptomsWhat You 
ExperiencePossible Solutions
MHL interface 
is not workingCan not see MHL 
device image 
shown on 
monitor•Ensure your MHL cable and MHL device are MHL certified.
•Check your MHL device is turned On. 
•Check your MHL device is not in Standby mode.
•Check physical MHL cable connection is corresponding to 
input source selected on OSD Menu i.e., HDMI (MHL) 1 or 
HDMI (MHL) 2.
•Wait for 30 seconds after connecting MHL cable as some 
MHL devices require longer recovery time.  
						

							Appendix  |  63
Appendix
WARNING:  Safety Instructions
 WARNING:  Use of controls, adjustments, or procedures other than those 
specified in this documentation may result in exposure to shock, electrical 
hazards, and/or mechanical hazards.
For information on safety instructions, see the Product Information Guide.
FCC Notices (U.S. Only) and Other Regulatory 
Information
For FCC notices and other regulatory information, see the regulatory compliance 
website located at 
www.dell.com/regulatory_compliance.
Contact Dell
For customers in the United States, call 800-WWW-DELL (800-999-3355).
 NOTE: If you do not have an active Internet connection, you can find contact 
information on your purchase invoice, packing slip, bill, or Dell product catalog.
Dell provides several online and telephone-based support and service options. 
Availability varies by country and product, and some services may not be available in 
your area. 
To get online Monitor support content:
1Visit www.dell.com/support/monitors.
To contact Dell for sales, technical support, or customer service issues:
1Visit www.dell.com/support.
2Verify your country or region in the Choose A Country/Region drop-down menu at 
the bottom of the page.
3Click Contact Us on the left side of the page.
4Select the appropriate service or support link based on your need.
5Choose the method of contacting Dell that is convenient for you. 
						

							64  |  Appendix
Setting Up Your Monitor
Setting the display resolution
For maximum display performance with Microsoft® Windows® operating systems, set 
the display resolution to 1920 x 1200 pixels by performing the following steps:
In Windows® 7, Windows® 8, and Windows® 8.1:
1For Windows® 8 and Windows® 8.1 only, select the Desktop tile to switch to classic 
desktop.
2Right-click on the desktop and click Screen Resolution.
3Click the Dropdown list of the Screen Resolution and select 1920 x 1200.
4Click OK.
If you do not see the recommended resolution as an option, you may need to update 
your graphics driver. Please choose the scenario below that best describes the computer 
system you are using, and follow the given steps.
If you have a Dell™ desktop or a Dell™ portable computer with 
internet access
1Go to www.dell.com/support, enter your service tag, and download the latest 
driver for your graphics card.
2After installing the drivers for your graphics adapter, attempt to set the resolution to 
1920 x 1200 again.
 NOTE: If you are unable to set the resolution to 1920 x 1200, please contact Dell™ 
to inquire about a graphics adapter that supports these resolutions.
If you have a non Dell™ desktop, portable computer, or graphics 
card
In Windows® 7, Windows® 8, and Windows® 8.1:
1For Windows® 8 and Windows® 8.1 only, select the Desktop tile to switch to classic 
desktop.
2Right-click on the desktop and click Personalization.
3Click Change Display Settings.
4Click Advanced Settings.
5Identify your graphics controller supplier from the description at the top of the 
window (e.g. NVIDIA, ATI, Intel etc.).
6Refer to the graphic card provider website for updated driver (for example,  
http://www.ATI.com OR http://www.NVIDIA.com).
7After installing the drivers for your graphics adapter, attempt to set the resolution to 
1920 x 1200 again. 
						

							Appendix  |  65
 NOTE: If you are unable to set the recommended resolution, please contact the 
manufacturer of your computer or consider purchasing a graphics adapter that will 
support the video resolution.