I have an IPAQ 5450 that will not turn off. I have turned off the wireless connectivity and made sure all programs are closed. I have it set to turn off after 2 minutes and it does not turn off. I left the device overnight in the car, which did not get below 50 degrees and I went from 100% power to 29% power overnight. Anyone have any ideas? I looked on the HP forum and this is a common incident.