Lenovo Yoga 2 not displaying/irresponsible?

So I recently purchased a Lenovo Yoga 2. Out of the box it was working great, after a couple of days my keyboard stopped working. After contacting Lenovo/Best Buy we figured it was a hardware problem, so I shipped it back to best buy for repairs. When my computer finally returned, I powered it up right away (Plugged in, etc.) and then noticed that nothing appeared on the screen. It took me a while to figure out what was going on. The startup sequence appeared as so: Turns on, keyboard lights, up, then nothing else. The keyboard's lights turn off and then appears unresponsive, and the screen is totally black. At least I thought it was, after some time I made out it was on, seeing my desktop background very vagualy in the background. The screen is quite, quite dark. I'm not sure what to do here.