Macbook air built-in keyboard/trackpad only work at login screen

The built-in keyboard and trackpad have become unresponsive on my 2013 refurbished macbook air. When I restart it, everything works normally at the login screen, but becomes unresponsive again once I've logged in. The computer works fine with external inputs or a shared screen.
I've recently updated to yosemite. The fact that everything works up until login makes me think this is a software problem. I've tried all the troubleshooting steps listed here, and I've reset PRAM and SMC. Does anyone know what could be causing this?

Hi,
I was able to get result from apple store after 24 days not hours days. They said it's my fault and they have found liquid inside of it and when i asked to see pictures of it they asked for COURT ORDER and repair will be cost around 400$.
I am %100 sure that my macbook air never touched with liquids.
I was using it for business and not even fluids there isn't any one scratch on it. I have been very careful.
Did they asked 400$ for you too ?
I am also using mac mini and iphone 5s. I think i will never buy an apple again.
And i will definetly go to court.
Repair R146244431

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