Mate at work has purchased an Amiko Alien Triple Tuner ( same as I have). All progged up adn working fine. HOWEVER.........on plugging the HDMI cable into the TV from the Alien SOME, but not all of the Terrestrial channels on his TV stop working (Pick, Film4 etc etc). On removing the HDMI from the TV they pop straight back on.
Any ideas as to what this could be??

Cheers