Right-click My Computer and select Properties
Click on the Advanced tab
Click on Environment Variables
Below the bottom Environment Variables window pane (System Variables), click on New
For Variable Name, enter devmgr_show_nonpresent_devices
For Variable Value, enter 1
Click OK to close Environment Variables and OK again to close System Properties

Device Manager, click on View and then select Show hidden devices from the menu. You can identify the hidden devices by their grayed-out icons.

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