I have the same problem. It also happens much more frequently (or maybe exclusively) when running on battery.
I'm in the middle of working on something and my screen goes black completely. Nothing makes it come back on: I try clicking with the mouse, tapping any key, even the on/off key, and I even tried closing the laptop and opening it again... but the only thing that will make it "come back to life" is forcing a shutdown/restart by holding down the off button. This is super annoying, especially because it's brand new!!!
My computer is only 2 months old and it has been doing this since I bought around mid-september 2013. It is a 13-inch macbook air with 1.7GHz Dual-core intel i7 and 8GB 1600MHz of SDram.
Anyone has gotten any official response from Apple about why this happens and if it's just a batch or if t's all macbook airs of this kind? What kind of solutions are there? I'd hate to have ot go into the store to get ti replaced (especially because I have already installed plenty of software that I need for work and school!).
Advice/solutions would be greatly appreciated!