External hard drive are not shown

I recently got a new macbook pro, I plugged my external hard drives to the laptop and they don't show up, (they are not in the mac format), but they work perfectly fine with my imac, and my old macbook pro had no problems with it at all, I was wondering what's wrong with it? When the external hard drives are plugged, the lights on the hard drives work.
Thank you!

1. maybe it needs more power.
2. maybe it's already mounted but hidden:
     goto Terminal
     defaults write com.apple.finder AppleShowAllFiles TRUE
     killall Finder
               to undo that just replace "TRUE" with "FALSE"
          open Finder
          goto Menubar and select Go - Go to folder
          input: "/Volumes"
          see if it's there, if yes, trash it and try again
3. maybe your partiton or hdd it's damaged, try to backup and reinitialize the disk.
4. try a different usb port.

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External hard drive are not shown

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