Dell Inspiron 15 laptop 5000 series keyboard frozen

Community,

I purchased this laptop last year and it has been working just fine until I tried to sign in last night. The touch pad works and I can move the cursor around, but the keyboard is frozen and I cannot sign on my password. I've rebooted at least four times, used ctrl+alt+shift+del, ctrl+alt+del, fn+F3, fn+F6 and that has not worked. Any assistance will be helpful. I bought the laptop from Best Buy.