Dell P221-OH appendix Product Specific Problems, Universal Serial Bus USB Specific Problems

		NOTE: When using '2: DVI-D', the positioning adjustments are not available.
Horizontal/Vertical Lines	Screen has one or more lines	•	Reset the monitor to Factory Settings.
		•	Perform Auto Adjust via OSD.
		•	Adjust Phase and Pixel Clock controls via OSD.
		•	Perform monitor self-test feature check and determine if these lines are also in self-test
			mode.
		•	Check for bent or broken pins in the video cable connector.
		•	Run the built-in diagnostics.
		NOTE: When using '2: DVI-D', the Pixel Clock and Phase adjustments are not available.
Synchronization Problems	Screen is scrambled or appears	•	Reset the monitor to Factory Settings.
	torn	•	Perform Auto Adjust via OSD.
		•	Adjust Phase and Pixel Clock controls via OSD.
		•	Perform monitor self-test feature check to determine if the scrambled screen appears in
			self-test mode.
		•	Check for bent or broken pins in the video cable connector.
		•	Restart the computer in the safe mode.
Safety Related Issues	Visible signs of smoke or	•	Do not perform any troubleshooting steps.
	sparks	•	Contact Dell immediately.
Intermittent Problems	Monitor malfunctions on & off	•	Ensure that the video cable connecting the monitor to the computer is connected
			properly and is secure.
		•	Reset the monitor to Factory Settings.
		•	Perform monitor self-test feature check to determine if the intermittent problem occurs in
			self-test mode.
Missing Color	Picture missing color	•	Perform monitor self-test feature check.
		•	Ensure that the video cable connecting the monitor to the computer is connected
			properly and is secure.
		•	Check for bent or broken pins in the video cable connector.
Wrong Color	Picture color not good	•	Change the Color Setting Mode in the Color Settings OSD to Graphics or Video
			depending on the application.
		•	Try different Color Preset Settings in Color Settings OSD. Adjust R/G/B value in Color
			Settings OSD if the Color Management is turned off.
		•	Change the Input Color Format to PC RGB or YPbPr in the Advance Setting OSD.
		•	Run the built-in diagnostics.
Image retention from a static	Faint shadow from the static	•	Use the Power Management feature to turn off the monitor at all times when not in use
image left on the monitor for a	image displayed appears on		(for more information, see Power Management Modes).
long period of time	the screen	•	Alternatively, use a dynamically changing screensaver.

Product Specific Problems

Specific Symptoms	What You Experience		Possible Solutions
Screen image is too small	Image is centered on screen,	•	Check the Scaling Ratio setting in Image Setting OSD
	but does not fill entire viewing	•	Reset the monitor to Factory Settings.
	area
Cannot adjust the monitor with	OSD does not appear on the	•	Turn off the monitor, unplug the power cord, plug back, and then turn on the monitor.
the buttons on the front panel	screen
No Input Signal when user	No picture, the LED light is	•	Check the signal source. Ensure the Computer is not in the power saving mode by
controls are pressed	green. When you press "+", "-"		moving the mouse or pressing any key on the keyboard.
	or "Menu" key, the message	•	Check to make sure Video Source to S-Video, Composite or Component is powered and
	"No S-Video input signal", or		playing video media.
	"No Composite input signal", or	•	Check whether the signal cable is plugged in properly. Re-plug the signal cable if
	"No Component input signal"		necessary.
	appears	•	Reset the computer or video player.
The picture does not fill the	The picture cannot fill the	•	Due to different video formats (aspect ratio) of DVDs, the monitor may display in full
entire screen.	height or width of the screen		screen.
		•	Run the built-in diagnostics.

NOTE: When choosing DVI-D mode, the Auto Adjust function is not available.

Universal Serial Bus (USB) Specific Problems

Specific Symptoms	What You Experience		Possible Solutions
USB interface is not working	USB peripherals are not	•	Check that your monitor is turned ON.
	working	•	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 2.0 interface is	High Speed USB 2.0	•	Check that your computer is USB 2.0-capable.
slow.	peripherals working slowly or	•	Some computers have both USB 2.0 and USB 1.1 ports. Ensure that the correct USB port
	not working at all		is used.
		•	Reconnect the upstream cable to your computer.
		•	Reconnect the USB peripherals (downstream connector).
		•	Reboot the computer.