My right click isn't working
A few days ago i was playing a video game to realise i couldn't right click and i was using a mouse, so i switched my mouse to an older one to realise it still isn't right clicking. then i used my trackpad and still my right click won't work. i called apple and they said they couldn't help me since my waranty expired. so what i did is that i formated my mac and yet still it just happened again!! can someone please please help me like as soon as possible please.
MacBook Pro, OS X Mountain Lion (10.8.4)