I have a Dell inspirion 13 Laptop which is pretty new. The laptop was working fine except lately when it started to have certain keys on the keyboard not responding/working. That didn't bother me much because those were the numbers keys until recently when certain letter keys started malfunctioning (i.e. letter t, s etc). To attempt to solve the problem, I have tried to install new bios and to delete and re-install keyboard drivers, all of which became fruitless. Please help me troubleshoot this problem further.