Normally if the sceen says to contact customer service, then that is what you should do.
Your first step to any troubleshooting is always unplug the cable box power for two minutes, then power it up again. That many times will correct the no IP address error 7 message.
If I only have limited cable will On Demand not work? I thought I could use On Demand even with limited cable because it is something that is paid for per show.
