

Test the hard drive on a PC - it could be formatted for PCs and not readable on Macs.Try the drive in another Mac - if it works there, the problem is with the USB ports on your Mac.Try connecting the hard drive to a different USB port - it could be a hardware issue.Try a different USB cable - even cables with no visible defects can fail.If the external hard drive is plugged into a wall outlet, try a different outlet.Check the cable - is it frayed, or are there any wires exposed?.


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