An external storage-device has four major components:
* the USB cable
* the power-adapter
* the disk-drive inside the enclosure
* the USB-to-disk-drive adapter inside the enclosure.
One of these components has failed.
Try a different USB cable.
Try connecting to a different USB port on your computer.
Try connecting to a USB port on a different computer.
Take a "multi-meter" and measure both the voltage and amperage output from the AC adapter, and compare with the specifications on the label on the adapter.
Open the enclosure, and remove the disk-drive, and then connect it as a "slave" disk-drive in a desktop computer, to see if it works at all.
Purchase a new, compatible, disk-drive, and install it in the enclosure, to "revive" your external storage device.
Get the part-number and serial-number from the label on your disk-drive, and access the manufacturer's web-site, and use "check warranty status", to see if they will replace the device, at minimal cost to you.
One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect your hard drive
Test all leads that attach to your hard drive including electrical extensions,IDE,SATA
the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electic extensions or just replace them they are probably faulty a computer needs its connections to have an end so any faulty leads will end up with a computer error hope this helps don
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