I have an old white infrared Apple remote for a 2008 Macbook. I lost my apple TV remote and can't get passed the setup screen. I can see that the Macbook remote is noticed by the Apple TV because the light blinks when I use it, but it doesn't control anything. Is there a way to pair it? At least temporarily so I can use the Remote app?
On the white remote, you must first press and hold the Menu and Previous/Rewind buttons for 6 seconds. This will clear out any old paired remote. Then, press and hold the Menu and Next/Fast-forward buttons for 6 seconds. This will pair with your remote.
(Source: Apple support page)