Have you tried getting to the boot menu of the phone by holding the Volume up button and the power at the same time.If the boot menu is working try to do hard reset or try to restore it to its original firmware via kies.
-Hard Reset
1. Hold the Volume Down button
2. Press and release the Power button
3. A menu will then appears
4. Select Clear Storage by pressing the Volume Down button
5. Press and release the Power button
6 Select Volume Up for YES and Volume Down for NO
-Guide on restoring original firmware with kies
http://www.samsung.com/ca/support/skp/fa...
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