My lite-on LTR-24102B cant read and write cd's except

Its just happend to me this morning. I was erasing and writing on a ridata cdrw three times using nero then suddenly after i insert other cd’s it wont read nor write on them. The ridata cdrw that i last used is the only thing that my writer can read and write though my cdrom and my liteon cdwriter cant read what data is writen on it. Its an old cd writer and it will be 3 years now this march and i have burned 1000+ cd’s on it.

I just want to know it there will be fix on this. somebody also said to me that i can try cleaning the lens with a cotton bud. I tried opening it but i can’t i can only opening the lower cover of it and thats all.

Thanks in advance…