I’m not sure where I’m supposed to respond, but somewhere someone mentioned having an external memory system. (I’m sorry, I’m computer stupid, so I’m not sure what it is really called.) But it was an external hard drive to backup and keep files. That was the problem! Once I removed it, no more problems with light burn. So Thank You for your attention to the matter. By the way, I’m investing in a fiber laser… YES!!! When will LB be ready for fiber lasers?