cq vd6503u

having a problem with the unit .works fine sometimes .but when i turn it off the face goes down and stays. when i turn it on it goes back to normal state. it only does it sometimes. the dvd wont eject sometimes and i have to usually set the tilt back up so the screen goes up  and also if u push the tilt button the screen sometimes goes up and down or just sit there and jerk a little .would it be the ribbon cable. i just had a new lcd installed  professionally by a panasonic dealer.   i dont think they changed the ribbon cable to the lcd could that be the problem

i took it back to the repair shop they had it on for four days straight and said there is no problem he told me to check my wiring but i told him that i have my kenwood deck hooked up and it works fine when i brought it home and hooked it up it did the same thing right away going crazy face up and down and wont eject my cd and tilt stuck on number 2 wont go to number 1 what could be the problem