Chosen Solution

Hello. I recently put all of my iPhotos and other items on my macbook pro onto my book. I am now trying to put them on a new macbook pro however when I open up the app on the computer I cannot find any of my photos from my iPhoto app

You don’t want to use iPhotos to import. Instead, you should use the new Photos app. Press and hold the alt/option key when opening the Photos app, and it should let you choose a location to import from. Select the old iPhotos library from the drive. Photos will then create an updated copy of the library that will also be shared with iPhoto to save space.

I would download and install a utility like OmniDiskSweeper that will sweep through the hard drive and show you the results in a window to see where larger folders and files are. The iPhoto library should be large.