Toshiba SD4300 Owner's Manual page 24

Troubleshooting
Problem
Player does not respond to some operating
commands during playback.
DVD Player cannot read CDs /DVDs
Menu items cannot be selected
Unable to select Progressive Scan on/off

Solution
-Operations may not be permitted by the disc.
Refer to the instructions of the disc jacket.
-Use a commonly available cleaning CD/DVD to clean
the lens before sending the DVD Player for repair.
-Press STOP twice before selecting system setup
menu.
-Depending on the disc availability,some menu items
cannot be selected.
-Ensure that the output of the Video Out signal is
switch to P-Scan/Component.