My external hard drive worked on my old macbook but not on my new one. Why?

I have an older macbook (white plastic case) and Just got the newest Macbook Pro (Mid 2014).
My external hard drive, WD My Passport 1TB, worked just fine on the previous computer but now when I plug it into the new macbook, it doesn't pop up. Additionally, I have gone to disc utility to check if it is there. It is not. I plugged it back into the old mac and it works fine so I don't believe its the external.
Anyways, I need some help. Please and thank you!

Good day rad292,
Thank you for visiting Apple Support Communities.
It seems like your external hard drive is not recognized by your new MacBook Pro. You've done a good job of isolating this behavior to your new Mac, and I'd recommend going through the following troubleshooting steps.
First, reset the NVRAM (also called PRAM) and the System Management Controller (SMC) on your MacBook Pro:
How to Reset NVRAM on your Mac - Apple Support
Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support
Next, try the steps in the "Top troubleshooting tips" section of this article:
USB and FireWire Quick Assist - Apple Support
All the best,
Jeremy

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