Check the following.

1. Check whether PC (USB-B) appeared on the display window of TA-ZH1ES.
   NOTE: Press INPUT button repeatedly to select PC (USB-B). PC (USB-B) appears in the display window.
   
   
   [A]: INPUT button
   [B]: display window
   
   
2. When Sony Headphone Amplifier Driver does not appear as a device name while setting up Hi-Res Audio Player application or TA-ZH1ES cannot be recognized by Hi-Res Audio Player while other devices are recognized.:
   
   
   • Check whether your Hi-Res Audio Player is Version 1.2.5 or higher.
     NOTE: If you have downloaded the application before Octocer 12, 2016, its version may be Version 1.2.4 or lower.
     Download the latest version from your local support page.
     
     
3. When the error message, Device not found, appears.:
   
   
   • Terminate the music playback software other than Hi-Res Audio Player.
     NOTE:
   • • If the problems still exist even though other software is terminated, there is a possibility that the software is not closed completely. Finish the software via the Task Manager.
     • If the measures above do not help, try unplugging and re-plugging the USB cable and restart the computer.