Mac Book Pro no longer recognizes My Passport

My Passport used to appear under devices in Finder but no longer does so........any suggestions ?

Does it appear in Disk Utility?
Can yo hear it spinning?
Any light on?
Have yo tried another cable? Another USB port?
Do the USB ports work with other storage devices?
Does it appear under USB in System Report (Apple icon in upper left>About this Mac>System Report)
Does it work when attached to another computer?
Try resetting the SMC and PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM

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