External hard drive unable to be found by any devices. Help!

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Hello,

My external hard drive has not been showing up when I connect to either a tv or computer. The hard drive itself will flash and run as though it is connected, but nothing will detect it.
I have just changed the setting for USB Root Hub in device manager to prevent it turning devices off to save power, I also did a scan to search for hardware changes and when I did this, it found the device but is now unable to install it. It comes up with 'No Driver Found'

Any ideas on how to fix this would be greatly appreciated.
Thanks