Does not read CDs

Hi. I bought this radio about 5 months ago and worked fine. All of a sudden the radio does not longer read/recognize any CDs. I've tried plenty, all of which work in other radios (and used to work in this one), and always get a "no" in the screen after a few seconds.

could the laser lens be bad? so fast??? what can I do? I tried cleaning it with one standard comercial CD cleaners (the one you play in the radio) but it didn't even recognized this..

thank you
omar