Has your Android 4.1 phone or tablet started to act funny? Google has introduced a new safe mode that may let you diagnose and repair the problem.
When your device is running in safe mode, Android disables all third party apps. Reboot your device and they should appear again.
In order to enter safe mode, press and hold the power button on your phone or tablet. When the power options menu pops up, don’t just tap the “Power Off button,” but press-and-hold it.
This will bring up a new menu that gives you the option of rebooting to safe mode.
The next time you reboot you’ll automatically return to regular mode unless you repeat these steps.
If you started to notice problems after installing a specific app, this provides an easy way to boot into safe mode and uninstall that app.
via Droid Life