Mac OS X Lion 10.7.5fter upgrde does not read external harddrive

Mac OS X Lion 10.7.5 fter upgrde does not read external harddrive

Hello there ZamirasDAD,
I was looking through our aricles about what you may be experiencing and recommend resetting your SMC and your PRAM.
To reset your SMC on an iMac you would use this article Intel-based Macs: Resetting the System Management Controller (SMC) found here: http://support.apple.com/kb/ht3964.
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
To reset the PRAM use this article named About NVRAM and PRAM found here: http://support.apple.com/kb/ht1379
Shut down your Mac.
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 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.
Regards,
Sterling

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