I’m a bit confused here. My friend just got a brand new model B+ today and he is using the same exact RetroPie 2.3 image that I am (the one from petRockBlog) and his Pi refuses to recognize anything plugged into the USB ports. He installed Raspbian and they work fine, but again stopped working when he switched back to the RetroPie image. I am really confused because we know his USB ports work, and that the RetroPie image works. Any tips on where to begin trouble shooting this?