how can i fix a jvc hrxv31ek video,dvd recorder?

Player locked up,does not respond to manual controls or hand control. Will not eject tape or disc. VHS indicator light on. Power switch on unit will not power off unit. Display flashing on/off.Was able to remove dvd by removing unit casing, but problem persists. Tried switch mains on/off and checked for sticking buttons.
Problem occurred during running dvd, when the unit was half way through the dvd programme, it stopped and reverted to tv.