External Hard drive no longer works in my mac

Ever since my macbook pro went flat my hard drive no longer is recognised on the computer. it comes up with the first picture uploaded. when I go to disk utility I can not click verify disk or repair disk but can see the hard drive there. I have no idea how to fix this without losing everything on the hard drive. I have no other mac to plug into and I plugged it into a pc but it does not show up, however the sounds when you plug something in and out are there. photo-1.JPG
 

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