One thing I failed to mention was that the logon session with Windows 10 was through RDP - a remote connection.  Apparently Windows does not allow access to microphones when accessing via RDP.  When I logged in via the console, it works fine. Thanks for the replies.
Hi, All... Just got a new Precision 5820 with Windows 10 preinstalled by Dell.  I'm not able to use a microphone when I plug one in. When I plug it in, a dialog does appear asking me if it's a microphone or line-in.  I've tried both to no avail. When I look in Settings/Privacy/Microphone it is turned on for apps. When I look in Settings/System/Sound under Choose your input device it says, No input devices found.  When I click Manage sound devices, nothing appears under Input devices. I do have the Realtek drivers installed. What am I missing? Thanks! Curt
Microphone not found