I need help. My nexus 7 won't power on. I've checked other threads and no button combo with the power and volume up and down buttons work. When on a charger, it give's no indication that it's charging. This is the second time it happened. Once before the 4.3 update, (about 2 months ago) it would turn on but after about a day and a half, i pressed the power button and it turn on. Now about a day after the update, it wont turn on again. i hope it isn't bricked. By the way i brought this on amazon on Jan. So i hope it's under warranty.