Add a new enviroment variable:
1) WIN+PAUSE to open 'system'
2) 'advanced system settings'
3) 'enviroment variables'
4) under 'system variables', press 'new'
5) enter "DEVMGR_SHOW_NONPRESENT_DEVICES" under variable name, and "1" under value
6) reboot, device manager should now show all devices.