Hitachi DVDVCR Combi Model DV-RV 8500E (UK) cannot recognise any disc?

I tried to initialise a recorded disc to remove its contents on a dvd-rw disc whilst initialising, it froze, when it had almost completed initialising and since then shows" No Disc" on the screen when any disc is inserted. Up until now it has been functioning very well. Can any one help, or suggest a repairer? The recorder is a Hitachi .DVD/Vcr combi Model DV-RV8500E (UK)