External Hard Drive was dropped, plugged it into my laptop and it seemed to be working perfectly fine. There was no visible damage. A few days later, it has suddenly stopped being recognized by my laptop while being used. There is no unusual buzzing or whirring sounds. The light turns on when it is plugged in and the mechanism does run, but it is not being recognized. Tried multiple USB ports to no avail. USB ports are in working order (tried by plugging my mouse and a thumb drive into each to check).
When plugged in, my laptop makes the tone that signifies that a device has been attached, it also begins installing drivers. Laptop has been swept for malware. Any ideas as to what may have happened?