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My Galaxy Tab P1000 just hung up, at a point where the power button is not responding. Is there a way to force the devise to shutdown immediately?
There is no "force shutdown" as far as I know, but you can force a reboot by holding down the power button for about 15 seconds.
For Tab S and Tab A
and Tab gt-5100
Should work with 8.4 or 10.5
Hold the Power button, Volume Down button, and Menu key for 10 seconds.
You will enter download mode, simply press the volume down button to restart tablet.
After reboot, you tablet should perform as normal
No force shutdown for galaxy tab, but you can use this trick.