@edgardopaz that is caused by either a dirty or a failed laser. You can try and get those commercially available lens cleaners and run that a couple of times. If that does not work, you could try and replace the laser assembly. Not sure if you can see this guide (it's in process [guide|95961] ) The other thing you can try is a pot adjustment for your laser. Worst case scenario with that is that you may burn your laser out. See if this will work for you [document|34262]