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Ashik
Ashik, Mac Technician
Category: Mac
Satisfied Customers: 10205
Experience:  Bachelor of Computer Application (BCA), 9+ Years of Experience in troubleshooting Macs, iPhone, iPad, iPod etc
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Please help....my iMac isn't recognising any external hard

Customer Question

please help....my iMac isn't recognising any external hard drives or USB's
Submitted: 1 year ago.
Category: Mac
Expert:  Ashik replied 1 year ago.
Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
First reset the System Management Controller of your Mac. Follow the steps below;
Shut down the computer.
Unplug everything including power cable.
Wait 2 minutes and plug in back power.
Press the power button to turn on the computer. This will reset SMC
If that didn't work, then reset the PRAM and NVRAM of your Mac. Follow the steps below;
Shut down your Mac
Locate the following keys on the keyboard: Command, Option, P, and R.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears and before the chime sound.
Hold the keys down until the computer restarts and you hear the startup sound for two or three times.
Release the keys and let the Mac bootup.
Please let me know if that didn't work, so we can continue troubleshooting.