Remember, if you have a guitar hero wireless usb receiver plugged in, it will always take the first controller spot - you can just take it out when not using it, or do as described above to regain your #1 controller
I'm not really educated on the alternative (or, OtherOS) operating sys you can install, other than some Linux versions will work. You might wanna read up on it before making mistakes.. would be sad to brick such a fine machinery
good luck mate
Hold the PS-button on the controller down, and go to "Reset controller number" (Just look for something like that, I can't remember exactly what it says TBH) and from there you can set your controller as #1, #2 etc.