Looking for help with my panasonic dvd-a105u. It was given to me by a friend and when I got it 2 years ago it played ok, some pixelating and occasionally it went back to the main menu, or locked up. It progressively got worse, then it quit playing dvd's. It will still play cd's but when I put a dvd in it either locks up or says "this disc cannot be played..." or I get a "NO DISC" on the display. I've cleaned the laser lens, checked the connections to the main board and looked over the other circuits. any other suggestions? How di I adjust the laser voltage, or position? I adjusted my ps2 when it had problems not reading. I just cant find anything to adjust on this thing...