LG GSA-H55N doesn't works anymore

Hello everybody! I’m new to this forum and I have a little (big) problem. My LG GSA-H55N doesn’t reads all my DVD’s or CD’s, just a few of them now, but in the past few weeks (4-5 weeks) it read all of them. By the way, it doesnt’s recognize blanks for writing. Can anyone help me please? I need it working again for the next week.:bow:

Sorry for my bad English.