Asus dock not working

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http://forums.androidcentral.com – I just got my nexus 7 this week and my Asus dock just came in the mail today. Much to my disapointment, I plugged it in and it doesn't charge or get audio through the dock. I read somewhere that 4.1.2 doesn't support docking but I verified I have 4.2.1. I don't get prompted about using the dock for audio like the YouTube video I saw either. I'm stumped. Am I missing something? (HowTos)