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HT1379: About NVRAM and PRAM

Learn about About NVRAM and PRAM

HT1379 Need and advice with respect to USB power usage.

482 Views 7 Replies Latest reply: Mar 28, 2012 3:10 PM by Klaus1 RSS
Akaki Calculating status...
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Mar 28, 2012 10:25 AM

Hello. I have an iMac desktop. Recently, my kid tried to charge a helicopter battery using on of the USB ports on the computer.  This led to me getting the following message -"Because USB device was drawing too much power from you computer one or more USB devices have been disabled'. I turned the computer off, disconnected the device and restarted the system. Everything seems to work, but the keyboard. And since the computer is password protected I cannot go beyond the start up screen.

I've tried the procedure for resetting PRAM as described here (, but nothing happens as I suspect the computer refuses to see the keyboard and on every new startup produces the same error message.

I've tried to unplug the computer, same result.

I shall be eternally grateful if anyone can advise me how to deal with my problem.

Many thanks in advance for any assistance you can render me in this matter.


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