My CM-7004 ConverterBox locked up on the guide while it was recording a program. I tried to "Exit" and that brought up a warning message about 'Recording In Progress ...'. The choices are the Yellow button to 'Keep Watching/Recording' and the Green button to "Change Channel". I tried both the Yellow and Green buttons. Also "Exit" but nothing happens.
Press the 'Power off ' button on your remote and leave it off for 30 seconds.
Now press the 'Power On' button and the CM7004 should go to live TV and operate normally.