You have to use a original ci modul thats is paired with your card for it to work. If you buy a modul from another supplier then your cable network you have to contact them and see if they approved this modul, if so give them the serialnumber on the backside of the modul and they will send you a new pairing key and then all will work just fine. There are almost never anything wrong with image when CI and CI+ conax moduls are not working since all decoding is done by the modul and not the reciver.