acer laptop keyboard key not working

I turned on my acer aspire 7250 laptop today and the period key (the key by the right shift button) what do i do (not even the question mark slash key works) i restarted the laptop twice and i even look on acer.com << that period is working because its the other period which is on the numeric right numbers where the num lock is... i think my computer still under standard warranty..

 

If the key is not working, then that's a hardware issue. If your laptop is still under a warranty, you should consider sending it for repair.