I am having problems reading DVDs that I burn on my Mac Pro 5,1. I can burn a DVD, eject and then reinsert and it may not load. I can take it to another Mac and it will load without a problem. I've tried to do some research without much luck. Most posts online are for Macbook with slot drive. I work in a printshop and there is a lot of printing dust so I'm thinking maybe the lens is dirty, how do I clean it. If it's dirty, will it still burn properly? That doesn't seem to be a problem that I can tell.