GMC 2008 Envoy Denali Owner's Manual page 231

Problem
No power.
Disc will not play.
The picture does not fill the
screen. There are black
borders on the top and
bottom or on both sides or
it looks stretched out.
The disc was ejected, but
it was pulled back into the
DVD player.
Recommended Action
The ignition might
not be in ON/RUN or
ACC/ACCESSORY.
The parental control
button might have been
turned on. The power
indicator light flashes.
The system might be off.
The parental control
button might have been
turned on. The power
indicator light flashes.
The system might be
in auxiliary mode.
The disc is upside down
or is not compatible.
Check the display
mode settings in the
display menu.
The disc is being stored in
the DVD player. Press the
eject button again to eject
the disc.
Problem
In auxiliary mode, the
picture moves or scrolls.
The language in the audio
or on the screen is wrong.
The remote control does
not work.
Recommended Action
Check the auxiliary input
connections at both
devices.
Change the Video Format
to PAL or NTSC. See
"Stereo RCA Jacks"
previously for how to
change the video format.
Check the audio or
language selection in
the main DVD menu.
Check to make sure there
is no obstruction between
the remote control and
the transmitter window.
Check the batteries to
make sure they are
not dead or installed
incorrectly.
The parental control
button might have been
turned on. The power
indicator light flashes.
3-97