Not much info to go on here.
I have a windows 10 laptop, i have been connecting hard drives to it thru an adapter, and it has been working fine. i have 3 old hard drives ranging from 1993-99, plugged in thru an adaptor, turning the power on, green light flashing as it should, then stops as the hard drive is plugged in and isnt recognized by my windows 10 computer. same thing happening to all 3 hard drives. wondering what the problem could be? i wouldnt assume theres an issue with all 3. they all turn on and seem to be running fine. as soon as i turn off/unplug the power from the hard drive, the light goes back on. im stuck.