I don't know what I have done, but the power button on the top, which I used to be able to press to turn off the screen, no longer works. I can use it to turn on the screen. And I can hold it on to power down, airplane mode, etc But pressing it once does nothing when the screen is lit up. Any ideas? I have tried wiping all data from the boot menu. This restores the functionality, but when I restore all my data and apps (MyBackupPro) the problem returns. Any idea?