hey there, I have a samsung R150. been using it for the past few months. worked great. recently it no longer recognises empty dvds that ive always used, even different kinds. I keep getting the same message " disc cannot be played". I have gotten a few to work, that's after inserting several. I cleaned the lens(dry) , but to no effect. thought of doing a firmware update, but the firmware on the recorder is more recent than the one availabe on Samsung's website. Any suggestions will be greatly appreciated. marc