CD/DVD players/writers use a laser LED to read and write and, short of physical damage, these are probably the weakest components - they are semi-conductors and can die. It is not even worth thinking about replacing the laser LED - just replace the complete drive if cleaning, as per OldPhil, doesn't work. These drives are fairly cheap and not difficult to replace.
I know you included a Speccy report which would have told me what type of computer you have, but you sent it as a zipped text file. The last, and only, time I looked at a Speccy report in that format my eyes hurt !
However, if the computer is a desktop replacing a drive is simplicity itself. Power off, sides off, touch a piece of the metal frame to earth your self, remove the two connectors from the drive, remove two screws from each side of the drive (the form of lock-in may be even simpler than this), slide out from the front of the case. To mount - reverse this procedure.
If it is a laptop the drive itself may be a little more expensive than one for a desktop but the remove and fit is normally even simpler ! The best thing to do is to search on YouTube for your computer 'Make, Model, and DVD drive' and you will almost certainly find at least one video showing you how to do it.
If you want to post a Speccy report again, all you need to do is to post the URL it gives you, these two images show how to find it -