HP laserjet cm1312 MFP doesn't scan

I have almost completed the installation of my new multifunction printer from HP and it prints and copies beautifully, but it doesn't scan. When I get to the point of the setup where I choose either USB or Network connection it doesn't show the printer when I choose USB. It's weird since it can already print... I've downloaded and installed the newest drivers and updates from both HP and Apple but it still doesn't find/list the printer when I attempt to set it up.

I'm really lost, so I'm hoping someone has an answer to my problem!