after reboot my samsung galaxy s2 is not working it is turning on and automaticaly it is turning off within seconds

Have you made sure it is charged? That would be the first thing to check.

If that isn't the problem, you might try loading it in "Safe Mode" (see below) and see if it will turn on.

To get into "Safe Mode" please do the following.

1. First turn off the phone.

2. Next press and hold "Power" until you see the manufacturers logo on the screen, then release the power button.

3. "Quickly" press "Volume Down" and hold it for few seconds until you see the message "Safe mode: ON" or something similar.

4. If you wanted disable it, simply repeat the steps above, and you should see "Safe Mode: OFF" rather than on.
 
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