My imac has stopped recognising my external HD

my imac has stopped recognising my external HD connected by USB. My macbook can read it. Is there some way of reset on the USB?

I would recommend doing the following two steps, as explained by our Expert User "rkaufmann87":
iMac SMC and PRAM reset:
SMC RESET
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Hope this helps

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My imac has stopped recognising my external HD

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