RESOLVED via a system rebuild. No clue as to why it was failing. Windows 10 PRO. AutoPlay isn't working in Windows 10. The SETTINGS|DEVICES menu has it turned ON. In Control Panel, it's turned on and configured to PLAY a CD. It's not disabled in the Group Policy editor. Neither of the two optical drives (a CD and DVD) will auto play either file type in Windows Media Player or MPC. An MS level I tech made this statement: "For this issue you can download Windows DVD Player available in the Store. Since WMP and MPC can no longer support CD / DVD autoplay." While I understand that there's no native DVD player in Win 10, it strikes me that auto play should function nonetheless - using the default CD or DVD app. Or is the tech correct? Can someone confirm this, and suggest what other measures might enable AP, please. All forum suggestions to this date have been tried.