my sagem dvr6200t does not respond to the remote. ?

neither does mine. it drives me mad. what am i doing wrong. yesterday it was working OK. my husband put on teletext, then turned off the tv without reverting back to the ordinary channels. this morning, i could only get text screen with no volume, now i have fiddles with so many things, cannot even get anything to work. how do i go back to the beginning and try again. i have turned off both main switches in the wall to try and clear it. no luck.

suebrown100@yahoo.co.uk
January 2009