Hi Esteem Members, I have a DM800HD PVR, it keeps showing tune failed error on all channels (FTA + cable), after which, the channels will show distorted Audio/Video. Test the output antenna by passing it through to a DM500, and everything works fine on DM500 (Connection is as such: Aerial/Cable antenna=>DM800=>DM500=>display.), hence can I safely rule out faulty tuner? kindly advise is there any things else to check/change to make the box work? Thank You in advanced!!!