error message saying not enough power to connect device to usb port
because a usp device was drawing too much power from my computer, one or more of your USB devices has been disabled
iMac (21.5-inch Late 2009)
Rest the SMC:
Intel-based Macs: Resetting the System Management Controller (SMC)
Next, disconnect all uSB device and connect them one at a time until you find the problem. Could be due to cable or device.