External drive is not reading

MY Passport drive is not being read thus it cannot back up. I already checked the USB ports with printer that is working fine. Its not reading my Nike sportband either is there an issue with software it was working fine before I left to Greece hmmm any suggestions ideas

Have you tried another cable?
Does it show in Disk Utility?
Have you tries it with another Mac?
Try a SMC reset:
http://support.apple.com/kb/ht3964
Ciao.

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