Corrupt External Hard Drive not detected (by 2 users)

have pc on turn on ext hd let it try loading for second turn it off then put it in another usb slot it should try reinstalling the drivers if it does and it still doesnt work its probably corrupt which doesnt mean that its no good try formating it i know it sucks to have everything lost but sometimes it happens thats why i dont like ext hd all it takes is the right bump and it messes up another thing you could try is try hooking it up to another pc