no button operation, battery disconnect/re-connect will bring screen to life. Both battery voltages are 3.93vdc (connected DMM to circuit board pins). Connecting to desktop says APX device, when pushing power button. Windows 7 says no driver installed on "7". Issue occurred while trying to read news on Google ("7" was very very slow), then closed cover, which contains magnet that puts the 7 to sleep. It never restarted after that.