I had the same problem with my wife's phone and i have been researching the problem and found out it is a a power button issues. Apparently this has been a problem with the S2. The way you can tell if it is a power button being stuck on is, when you put the battery in and it starts to boot keep hitting the power button repeatedly while booting and see if the phone boots up. After i worked the power button for a couple minutes the phone seems to be working fine now, but i am sure this problem is going to get worse.
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I hope this helps
Yes, I agree with Adam. The problem appears to be with the power button.
Step 1: Remove the battery
Step 2: Re-insert the battery into the phone while at the same time you must repeatedly press the power button as the phone begins to start on so that the vibrating will stop. From there, the phone should boot up as normal to the main menu.
I hope this helps with everyone encountering the same problem on the Galaxy S2 as it worked for me and my phone was able to turn on and the vibrating came to an end. Enjoy!
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