Sounds like the power adaptor has failed. (Possibly a broken wire at the connector).
I assume it is a USB connection? Does it also have a power adaptor or a USB dongle that has 2 USB connectors? If you cannot get it to power up, the only other option to retrieve your data is to take the HD out of the case and connect it to a PC or laptop using a SSD or SATA to USB adapter and see if you can get the PC to recognize it.
SOURCE: Maxtor External Hard drive not compatible with Mac
I would check Maxtors website to see if there is compatibility issue using that particular drive on a Mac.
SOURCE: Maxtor Basics external portable hard drive not getting detected
I have a Western digital model wd2500b007-rnn
and I cannot get either my PC or my laptop to recognize the drive. I isolated the drive to another computer with the same error. It says USB device not reognized. I also tried a different port. I have not tried different cables. Can I retrieve the old data on the drive?
Did you find a resolution for this? I am having the same problem. None of my PCs can recognize the drive. Formatting seems to be the only choice but I need to recover my old data first.
SOURCE: power supply details for Maxtor 500 gb, external hard drive and ? manual
The PSU for my Maxtor 500Gb 9NZ2A4-500 drive is 12V DC, 2A rating, 2.1mm "plug" with centre "hole" as positive.
Regards, kbsguru
SOURCE: power supply for Maxtoe Basics External Hard Drive 500GB
Is 12VDC 2,0A the inner pin is + and the outer pin is -
SOURCE: MAC Computer won't recognize Maxtor External Hard Drive
that disk is not detected by windows due to power failure to your hard drive. check power of your drive.
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