Hello. My name is***** can help you with your question.
It's possible that, especially if it's been sitting for a while without being used, that the lens and lens block needs to be cleaned. This is something that you can do easily with a cleaning disc that you can get for a few dollars. So what I would suggest doing is getting this cleaning kit and running it through it based on the instructions that come with it and there's a good chance that will work. If it doesn't then we will have to explore other options which would most likely be repair of the hardware and may be replacement of the laser block. Here is a link to a disk cleaner: