external hard drive - WD "My Passport" unable to be detected on Lenovo T450

I have a WD "my passport" external hard drive. I got a new ThinkPad (Lenovo T450), and when I plug in the hard drive, the light comes on and the drive makes a "whirring" sound. But the drive is not showing in My Computer.

I looked in Device manager - there is a yellow triangle showing up beside "unknown device" under "other devices". I'm guessing that might be my hard drive?

It is not showing up in Disk Management either.

Any help would be appreciated!
Thanks!