When following these instructions in reverse, and reinstalling the I/O board, be sure to carefully check and adjust the alignment of the ports on the board with the holes in the case - it is especially obvious if the headphone port is mis-aligned with the case.
I don't think this step is necessary if you aren't seeking to fully remove the I/O board - if you are seeking only to remove the heatsink, you can skip this step, leave this delicate cable attached, then in the next couple steps you'll end up "flipping" the board out of the way, while leaving this cable connected.
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