Magicjack USB works on older 24 inch iMac but not on newer 27 inch imac, why?

When i call MAGICJACK and APPLE they tell me that there is not enough power in the USB  connection behind my 27 inch iMac
My 24 inch iMac works fine with it
any reason why?
i went to the apple store and all the new portables work fine with the MAgicjack
The desktops do not work with the magicjack
not enough power?
HELP ME PLEASE

Strange. Try doing a couple of basic resets: First is restart the computer in Safe Mode, this will clear the caches. If no luck there try both a SMC and PRAM resets. The SMC is OK to try several times.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
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.

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