Start at the beginning,
Home build, assembled on 13 11 2020. Gigabyte X570 Aorus Elite MB Rev 1.0 Ryzen 7 3700x cpu 32 Gb corsair ram Saphire RX 580 graphics Samsung 980 ssd
Win 10 pro 2004 build 19041.685 V20H2
Updates: 2020-12 KB4592438 2020-10 KB4580325 2020-12 KB4592438 2020-10 KB4584229 2020-11 KB4586781
20 Updates to Defender.
2020-11 KB4586876 KB4580419 KB4586876
Same result for dvd or cd. When you have "this pc" open the icon changes when you insert a disc, the dvd and image of a disc gets bigger, and if its a cd the icon changes to cd.
If I plug in an external usb drive, it reads and displays as it should. I used this to re install the drivers from the motherboard dvd, no change. Device manager indicates al ok, no warnings. No error codes are displayed, just a little box that says Please insert disc.
Good luck ! I'm going to investigate the registry, but I would have thought repair install would have fixed any problems there.