Dell SE197FP Monitor - Manual (Page 27)

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No Input Signal
when user
controls pressed No picture, the LED light is green. When
press "+", "-" or "Menu" key, the
message " No input signal " will appear. l Check the signal source Make sure the
Computer is not in power saving by moving
mouse or pressing any key on the keyboard.
l Check whether the signal cable is plugged in
and seated properly. Re
-plug the signal
cable if necessary.
l Re-boot the computer or video player.
OSD Lock All buttons are locked except the "menu" button. No user
adjustments are allowed. l Press the "menu" button for over 15 seconds to unlock
the OSD menu.