Black screen on TV BBC news hd when I switch my T4000 box on
Upgraded from DTR T1000 to T4000 by BT. Plugged in the aerial and aerial out ports as in the T1000. BBC news hd on ch 107 on the TV goes black when I switch on the T4000 and the TV is showing 0% signal. All other channels on the TV 101-106 work fine. The BBC newshd is also fine if I watch it through the T4000
Some other posts suggest the signal is too strong but the BBC news hd channel is actually on a much weaker transmitter the the other hd channels.
When I switch the T4000 off, the BBC news comes back.