I picked up my Xoom this morning. Activated it. Have it configured for 3G and WiFi. I have a blue tooth stereo headset paired up with it. I've been using it all day. This afternoon, while plugged in to the wall charger, it bricked. It was running Pandora, setup to use WiFi for Internet access. Pandora was paused. Holding the power button does nothing. Is there a way to hard-reset this device?