Brand new My Passport not recognised by Mac

I just bought a new My Passport 1T external harddrive, but when i tried to connect it to my Macbook Pro my Mac couldn’t recognize it. It had not been connected to any other PC or Mac before.

I then tried to connect My Passport to my friends Macbook Air and that worked perfectly. I know there is nothing wrong with my USBports, since i troed connecting several flash drives to my Mac and that worked perfectly.

I have tried finding it through the disk utility app and it doesn’t show there either.

I really don’t understand why my Mac can’t recognize the Passport, especially when my friend’s Mac had no difficulty finding it.

Can someone please help me?

Try the steps provided on the following link:

WD external drive is not assigned a drive letter by Windows or Mac OSX and data on the drive is inaccessible

http://wdc.custhelp.com/app/answers/detail/a_id/1164

That’s what i have tried before; Disk utility. The problem is i can’t choose the disk there, because my Mac acts like there is no disk connected so it doesn’t show.

Thanks for the answer anyway.