Not powering on, grayed out in devices and printers in Windows 7

Hi

I’ve got a problem with my go pro hero 4 black it is not powering on without the ads card and no battery (usb connect to pc)

Have tried to update the firmware but the pc can only see the device as grayed out and not on the system usb devices.

Has anyone any ideas what has happened/ any fixes (hardware or software)

Much appreciated for any help

Jim