One other thing I had to do to get it fully functional was to clean the lens on the laser with a cotton ball with nothing on it (I didn't have a cotton swab) - So if you have a DVD/BluRay/CD player that stops reading discs first clean the lens - took about 30-45 minutes and cost nothing.
There are a lot of threads where people have units not reading some disc types after time. They send them away for $400 repairs when a simple cleaning of the lens may have fixed their issues. From what I have read you cannot trust disc based lens cleaners and you need to open the unit and manually clean the lens (albeit lightly clean it)
The unit I got would play CD's, DVD's SACD's but could not play SACD Hybrid discs - after I cleaned the laser they worked fine.