I,ve lost the tuner on my Toshiba RD-88DTKB HDD DVD?

After setting the timer to record using the epg system my rd-88dtkb dvd recorder it froze with the epg on the screen, I was unable to turn off the dvd player or exit the epg using the remote. I eventually turned off the plug socket. Since then I am unable to get any programs digital or analoge, the machine will not search for programs automatically or manually it is as though there is not a tuner in the machine any more. All other functions appear to work correctly