Method 2: Connecting to the back USB PORT If that doesn’t solve the problem repeat the steps from 1-9, right click the greyed out entry and select Scan for Hardware changes.
Type cd windows\system32 and press EnterĬonnect your external hard drive once the computer is restarted. Type set devmgr_show_nonpresent_devices=1 and press Enter. Click Start then type cmd in the search box and press CTRL, SHIFT and Enter simultaneously ( CTRL + SHIFT + ENTER). Locate any greyed out Right click and select Uninstall for any grey entries you find. Expand all the entries by double clicking them. Method 1: Check Device Manager for disconnected devices For Windows 8, 8.1 and 10: The solution for this would be to format the drive in Windows in order for it to work on Windows (make sure you back up the data before formatting). So if you have been using your external hard drive with a Mac then it might cause issues on Windows (and vice versa). Mac and Windows use different file systems (Mac uses HFS and Windows uses NTFS) for USB and external drives. Now check your external drive with the computer that’s causing the issue. If your device is working on another PC then right click on the drive and select Format (make sure you back up your date before formatting). If the external drive is working on the other computer then that means your drive is fine, the problem is probably with a specific PC. Try to use your external drive with another computer and check it works there. Try to plug in your drive in different ports. The lights should turn on when the external drive is connected properly. 
If your external drive have lights make sure to check if those are on. Try to plug it in a few times and move it a little bit. 
So make sure your drive is properly connected to the USB port.
A bad or lose connection between the port and the external drive can cause this problem as well. Your USB port needs to connect properly in order for your drive to work. Sometimes the problem might simply be in the connectivity.
But first go through the troubleshooting to help you determine where the actual issue is. Since there is no solid way of checking what is causing the issue, start from method 1 and keep going until the problem is solved.
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