In message , Jean Fredette
writes:
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There are six different "headphone like" audio jacks on the back.
Blue, green, and red in the top row.
Brown, black, and grey in the bottom row.
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Blue: stereo line in. Nov very rare on laptops, usually OK on desktops.

Green: stereo line out; may have enough oomph to drive 35 ohm
headphones. (Old sound cards - and I'm talking ISA!, like the original
SoundBlaster! - sometimes had enough oomph to drive unpowered speakers,
e. g. 2 watts per channel; but the almost universal provision of powered
speakers stopped sound card manufacturers putting drive in their cards.
[I'm pretty sure they predate the colour code.])

Pink: microphone in. Often (usually, I think) mono - it may be a
three-terminal connector, but the third is bias volts out for electret
mics, not other channel in.

Brown, black, grey: for rear channel speakers and sub-woofer, in 5.1 or
7.1 channel use. (I forget which is which.)

Those are the defaults; however, many these days have auto-detect,
detecting when you misconnect, connecting an input to an output or vice
versa.
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

in the kingdom of the bland, the one idea is king. - Rory Bremner (on
politics), RT 2015/1/31-2/6