To resolve a problem with channels not changing while using a satellite receiver with a serial control cable, perform one or more of the following steps:
Resolution
Press the Guide button to verify that your channel list is set up. If your channel list is not set up, you will not be able to change channels using the Channel Up/Down buttons.
Ensure that the cable box or satellite receiver is turned on and receiving power. If the cable box or satellite receiver is turned on and receiving power, but you are unable to see any of the menu screens, go to My DVR Powers On, but I Don't See Any Screens: Troubleshooting.
Be certain you are using the TiVo DVR remote, and that you aim it so the TiVo button points toward the DVR rather than at the cable box or satellite receiver.
Ensure that the purple end of the IR control cable is plugged into the Channel Change IR or Control Out IR connector on the back of the DVR.
Unplug the cable box or satellite receiver from the wall, and then plug it back in again. Try changing channels with the TiVo remote again.
Try using the cable box or satellite receiver remote to change channels. If the remote does not work, contact the manufacturer or service provider for assistance.