i have t999 and suddenly it stopped working, when i turn it on it only displays samsung and restarts.
its not even going in recovery or boot mood, restarts after 2 or 3 seconds,
so i am unable to reset it or use odin.
I am assuming the Battery is full or charged? If it is and then see if the phone can stay in Recovery Mode with Home +Volume Up+Power. If the phone reboot by itself while in Recovery then its likely that your Power button is stuck.
Depending on your Technical skills, you might be able reset it or may have to take it to a technician.
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