While trying to open a facebook post last night, my Nexus 7 (2012) went blank as if it powered off. When I powered up, I got the word Google, then the rainbow X. Nothing will happen after the X. I've tried powering off and back on with the same results. If I hold down both buttons on the right, I get the android and options for Start, Restart Bootloader, Recovery Mode, and Power Off. When I choose Recovery Mode, I get Google then the android figure with an exclamation point and "No commend." Any ideas on what I should do to get going again?