I think it is a software issue, because I am able to do a SMC and PRAM reset. also while the mac boots, if I press Command + V it does do some stuff. So I think there is no hardware issue. As soon as the login page comes, the trackpad and keyboard stops working. I am running the EL Capitan GM. Thinking about updating to 10.11.1 Public Beta. External mouse and keyboard works fine. Also when I go to system preferences, trackpad and keyboard option do not recognize the built in trackpad and KB. Please help!