Aspire R5-471T sound out of one channel only (headphone)

Hi.

My Aspire is about 3 months old and I am hoping someone has a fix other than what the Acer Care people told me - to do a complete reset.

When watching a movie or listening to music there is sound only out of the left channel. Both channels are in the left headphone. I've tried other headphones and it's the same. There is stereo through the laptop speakers.

I've tried all of the settings. I bought two laptops at the same time and the other one is fine and has the same settings.

I think it is hardware, but I'll try anything at the moment before I do a complete reset.

Thanks

Russell