Popping noise and right speaker won't work

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https://bbs.archlinux.org – No sound comes out of my right speaker. I tried turning the volume all the way up in Alsa mixer for the relevant channels (I can't remember exactly which ones but I followed the steps in the installation guide). This happens with both my laptop speakers and my external speakers (they connect to the headphone jack but they aren't really headphones). Also, I'm getting a consistently timed popping noise coming out of that speaker, but only from my laptop speaker. It's like a metronome. When I plug in my external speakers it goes away. I turn the volume all the way up on the sp (HowTos)