Obtained this from another forum.
Tried it on my I40 to clear a frozen screen and it worked.
To reset media/sat nav units in Australian I40s which do not have a reset button proceed as follows.
Turn unit on
Simultaneously hold down Cd eject button and power/volume knob (on left of unit) while turning volume knob to lowest setting (anti clockwise)
Unit will turn off.
Turn unit on again.
Tried it on my I40 to clear a frozen screen and it worked.
To reset media/sat nav units in Australian I40s which do not have a reset button proceed as follows.
Turn unit on
Simultaneously hold down Cd eject button and power/volume knob (on left of unit) while turning volume knob to lowest setting (anti clockwise)
Unit will turn off.
Turn unit on again.