I have just taken delivery of a new Humax 7500T and all went well with set up until after about 15 minutes the video began to flicker (to black, not pixelated). this can be several times a minute and sometimes several times in quick succession. This is not an entirely new setup ... the Humax replaces a Topfield which did not have this problem so I don't believe it is a cable connection issue. This happened yesterday ... this morning I tried again and same problem, good for 15 minutes, then flicker is back. Faulty power supply perhaps?