Only part of my macbook pro keyboard backlight works

only part of my macbook pro keyboard backlight works , all settings and f6/7 keys work ok but only a triangle in the centre lights up, so the rest of the keyboard is dark.
Pleqase someone shed some light.
Bought in May 2012

It is likely a hardware defect.  If you bought it in May of 2012, it is still under warranty.  Take it back to the store or mail it in to be fixed.

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