Very non-savvy on these things, but wife turned TV etc off last night and now I cannot get the handset to instruct the set top box. Have turn off at the mains for 10 mins., done 'TV & Red button for 5 secs' and the Box button for 10+ secs but no response. The Box only works from the box buttons. I do notice that the PVR button just flickers rather than flashes off and on, so anticipate the handset is broken. Any other thoughts ?