Speakers - both channels out of right speaker

Hi - I have a Macbook Pro, bought second hand so should have said at the time, but....
All the sound, both channels, comes out of the right speaker. When i go into the Audio MIDI set up app, and play with the channel testing for the built in output, when i do the white noise test on channel 1, it comes out of channel 2. Channel 2 then obviously comes out correctly. When the channel 1 test comes out of the right speaker, it's just not quite as strong and clear sounding as the right channel sound. Then if i've got music playing and i go to the sound preferences, when i use the balance slider left to right, when left, it's still playing out of the right speaker, just quieter.
When my headphone or external speakers are plugged in, it works just fine. Left and right are perfect and I can use the balance slider to move the sound left to right and it behaves accordingly.
I was on Mountain Lion and am now on Yosemite and it's made no different. It had Mountain Lion when i bought it.
Any ideas?
thx

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