How do I re-enable USB Devices when they were disabled?

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Level 1

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I always have a iphone USB cable plugged into my Mac and sync to wifi, and iphoto.

When I connected the iphone, a message popped up:

USB Devices Disabled

Unplug the device using too much power to re-enable USB devices.

I do not have any thing else plugged into USB ports. I removed the phone - and it did not show up in itunes or iphoto as being connected.

I have searched systems etc and can't work it out.

I don't have any USB enabled from the looks of things. And my Apple support ran out two months ago...

Thanks in advance!

iMac, Mac OS X (10.7.1)

Posted on Oct 31, 2013 11:52 PM

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Answer 1

Best reply

Level 5

7,982 points

Try disconnecting everything, the try these:

Reset SMC:

Follow directions for a battery you should not remove yourself

Reset NVRAM/PRAM:

Power off, power back on holding the following keys COMMAND+OPTION+P+R hold these keys till you hear the start chime 2 times, then release, reboot

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Answer 2

Level 1

0 points

Thank you. I appear to have been using a tempermental USB cable that has problems when plugged into the wall power too. All seems to work now!

Thanks for your time.

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