External drive not detected on Mac [Closed]


I have a Seagate " Backup Plus Portable Drive" which was working just fine. I just plugged it into my computer and it cannot be found. It is not on my desktop nor is in my Disk Utilities. I've tried the other USB port on the computer and the same result. I have tried it on another computer and still not working.
PLease note: when i connect connect it to my laptop the light goes on. It just isn't being recognized.

Please Help!