I've had my iPad 2 for one week. e-mail froze up on opening, exited, and held button, slid red slider, and device has been in perpetual shut-off mode for 12 hours now (dark screen with white clock rotating clockwise). Hooking to laptop does no goo - error message accessing iPad is shown. Am clueless what to do. Normally I would remove the battery to reboot. Can anyone help with this?