I have a wired pair of HS60 Corsair headphones. Recently the audio started only coming through on the right side of the...

This is a pretty common issue with these headsets. I have had the same problem with two of them. If you disassemble the left side of the headset, you can get to the power switch on the bottom of the power board. There is a metal clip covering the power switch. Be careful when removing this, because the power switch can fall out easily after the switch is removed. Inside of the power switch are 4 tiny metal pins that slide on a contact rail to turn the headset on/off. Remove the power switch carefully, as to not knock out any of the pins, and set it to the side. Take an alcohol prep pad and something to push it with, and wipe up and down the contact rail where the power switch was. After a thorough cleaning, put everything back together. I can't stress enough how careful you should be when reinstalling the power switch and its metal clip. If you lose those metal pins you're going to have a bad day. It has caused me a headache before, trust me.