Hello - I've been having issues with my work iMac. I've never had to view DVDs/CDs. but recently came in to some. The issue I'm having is El Cap is NOT recognizing my official Apple Superdrive via USB which works just fine with my Macbook pro, Mac Mini etc. When I insert a DVD....nothing. I decided to use a wall-powered LG USB Drive. I've verified this works on a Windows machine. Once again, nothing. The only thing under "devices" is 'Remote Disc'. I tried resetting SMC, rebooting etc. The drive will accept the discs but thats it. Sometimes eject (on the LG External drive) does not register. I've also swapped this out for an IDENTICAL drive and still the same issue. Any help?