Disc Error/no disc messages

My problem is simple, the Player (T512) does not reconize any audio cd's at all it simply says "no disc" when they are inserted. DVD's load fine at first, the player reads them spins up, then spins back down and auto ejects the DVD, with the message "Disc Error". I opend up the player, and cleaned the lense, I started the player without it's cover and to me all mechanism's appear to function normal in the loading process. The only thing I've taken note of is that it seems that the player makes more noise the unsual when spinning up, a kinda humming sound that I dont think it has done prior to this problem. It should also be noted that this problem has increased from being a small problem where I had to reload the DVD/CD every 5th time or so.. to now .. where nothing will work at all. I have a feeling this is not something I can do anything about, but if anyone could confirm my worries, cheers Mort.