@steve the G7503 is the original DSE/Zinwell freeview DVB-T box. I've got one that someone else is using, not sure if it is going tho?... and asking someone else in the room confirms the box in Porirua us working fine.
EnnisElf: Its a DVB-T, which had been working perfectly until 1 or 2 days ago. Then the vidoe seemed to come & go. Now it doesn't provide any channels. I've restarted & retuned without success.
This is a typical problem with this unit. They fail completely after about 2 years following the sympons you describe. Take it back and ask for a replacement under the CGA. Mine failed just after 2 years (only produced a picture when it got really hot) and I got a replacement OK after finding proof of purchase. Took about 6 weeks. Has been other cases of same problem on this forum and replacements have been forthcoming from DSE.