[Peter_]

Originally Posted by Stephen

Well yesterday morning my S3 died.

It keeps restarting, get the Samsung logo and then it reboots. Not sure what's happened.

Need to get an official rom and try to flash it.

Have you tried a hard reset.

Note – Make sure you backup all your application and data before hard reset your Samsung Galaxy S3 (if you still can). Use Samsung Kies, titanium Backup or CWM to do the backup. How to factory data reset Samsung Galaxy S3? There are 3 ways to do so. Performing a factory data reset via settings

1. Go to Settings.
2. Select Back up and reset.
3. Click on Factory data reset ~ Reset all settings and delete all data on device.
4. Select Reset device.
5. Finally, select Erase everything.

Performing a factory data reset using phone buttons

1. Turn off Samsung Galaxy S3.
2. Press and hold down Volume Up + Home + Power buttons at the same time.
3. Release all buttons when you see SGS3 Logo.
4. Android system recovery will be loaded then.
5. Select wipe data/factory reset. (use Volume buttons to go up or down, select with Power button)
6. Select Yes — delete all user data.
7. Finally, select reboot system now.

Performing a factory format using dialpad

1. Warning ~ no turning back after key in.
2. Bring up dialpad.
3. Key in *2767*3855#
4. Finally, SGS3 will be rebooted and factory format.

That’s all. Enjoy your new fresh Samsung Galaxy S3.

Video showing how to hard reset

http://www.youtube.com/watch?v=it6pIvfKorM