hi, I have the same problem and have tried testing it in a friends house and it works fine. my line is online, I have the latest firmware/channel list, I bought a no signal fix and nothing. I had a new dish and lmb installed and still the same. any help would be really appreciated.
When you tried the "no signal fix", did it make any difference to the channels you could/couldn't receive, or did you lose all channels? I'm just asking as the way you worded it, it sounds like you lost all channels.
Do you have any other boxes connected to the same LNB?
If you don't have any other satellite boxes yourself to try, could you borrow your mates box to try with your dish?