1tb external WD not recognising anymore

Hi
I'm currently using an iMac (2011) running OS X Mavericks 10.9.2.
I've been using a 1tb WD My Passport external hard drive for about 6months. The hard drive has worked fine before with this imac, my brother's macbook air and our PC. I updated to 10.9.2 today and my hard drive doesn't seem to connect to my imac anymore (i've yet to ask my brother when he updated his). The hd still works with the pc. Any chance of a solution?
Many thanks.
-Update- I've asked my brother and he has updated his mac air to 10.9.2 today aswell. I'm presuming it's a software fault/error?

doubt it
had an external 1tb wd hd and it started acting up
in the end it would not work at all
I opened the external box and took out the hd itself and put it in another ext enclosure and there it worked fine so wd was better at making harddisks then at making the external boxes's assume it was an issue with the psu
as it made sounds like it was not getting enough power for the hd to spin up correctly

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