is it possible to delete all channels & guide information & start over

[bnewt]

is it possible to delete all channels & guide information & start over

having trouble picking up a strong hd channel & have tried adding manually
when trying to edit sources, it says 100%, but still no picture or sound
thought it would be best to just start from scratch.............is that possible?

 

[sdowney717]

I did this by deleting the tuner and also moving the tuner card to another slot.