*Help* Surprise MBA Gift for Fiance but..

Hi,

I just got my fiance a new macbook air which I researched thoroughly before deciding to go for the standard 13' model. I got it from the nearest store, unboxed it and completed the registration part.

10 minutes after logging into Lion, I am unable to use the trackpad and keyboard. I tried to restart Lion many times but its not usable at all. Any idea what the issue could be? I barely lifted it off from the table and everything was working well during the first boot up..

This is so frustrating because it's suppose to be a surprise for her. I went back to the store immediately and they are reinstalling Lion again. If it still doesn't work, they will replace it.

Any ideas on what might went wrong?

If it's a software issue, reinstalling Lion might just solve it. (though not sure)

If it's a hardware issue, reinstalling won't help and either way I am going to have to make a few trips to the store!

Strange thing is that, everything was working fine and suddenly just...

Got a new one from the store again. Turned out a faulty piece.