since it picked up the local over-the-air stations, sounds like you didn't turn off the antenna booster button.
it has to be off to be able to detect cable stations.
pretty common mistake that many make.
once it's off, go to the tv's menu and have it do a cable channel search, not the air search.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC