External Drive showing only in system profiler

I have had a 1TB Western Digital Ultra external hard drive for nearly year. Out of nowhere it will not show in disk utility but it does show in system profiler. I have a Macbook pro mid 2012 running Yosemite 10.10.1 I have of course tried searching myself but found no clear answers. I tried verifying the main disk and found nothing wrong. Other external drives work fine with this port and cable. Could it be a hard ware failure? Thanks for the support guys I'm just trying to identify possible causes.

Details given by system profiler: My Passport 0741:

Product ID: 0x0741 Vendor ID: 0x1058 (Western Digital Technologies, Inc.) Version: 10.22 Serial Number: 575831314139335031333539 Speed: Up to 5 Gb/sec Manufacturer: Western Digital Location ID: 0x15200000 / 4 Current Available (mA): 900 Current Required (mA): 896