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Helpful answers
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Oct 15, 2015 1:07 PM in response to dearlouiseby Pmintz25,Do the external drives show up in Disk Utility?
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Oct 18, 2015 8:44 AM in response to dearlouiseby dearlouise,Any ideas...? At the moment my macbook is essentially an expensive iPad.
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Oct 19, 2015 1:44 PM in response to dearlouiseby Pmintz25,Try and SMC reset. This can resolve issues related to power. Could be that simple. Just make sure there is nothing connected except the power cord.
Resetting the System Management Controller (SMC) on your Mac - Apple Support
I would make sure you computer is up to date. Could be missing a required firmware update.