Magic Mouse

My magic mouse is no longer powering on/being picked up by Bluetooth. I thought I may have had to re-pair it since I had a larger hard drive installed by Apple for my MacBook Pro, but it doesn't look like it's powering on. I tried replacing the batteries with brand new ones, and nothing happens. I even took the original batteries that were in the Magic Mouse into another controller and they worked fine, so it definitely seems like an issue with the Magic Mouse itself.

As always, any assistance is greatly appreciated.

Thanks!