I have an Avant and various Beovision 6's throughout the house. We have a Sky HD box and Sky + box. The entire system has been working perfectly for years. However, the Avant has recently stopped controlling the Sky HD box. The IR cable is plugged in (to the Avant) and the Sky + box is controlling through the avant however, the Sky HD box is not

We have an AVANT DVD in our lounge connected to a SKYHD + box by scart and also an infrared lead. The same SKYHD is connected to a Beovision 7 which is the master TV. In other link rooms we have Beovision 6 TVs. The problem we have is as follows: 1. Starting with the AVANT switched on viewing SKYHD. 2. Next switch the Beovision 6 on in a link room.