I am at a lost as I don't know which source to choose on the TV, I thought it was AV but it says no signal. How should I connect this?

When I connected the Panasonic player, a message appears stating WAIT, the DVD player opens and refuse to shut and then U81 (error) appears. According to the manual, I need to turn the unit back on and it should clear but the unit says bye and it switches off. Appreciate any help please! Thank you.