How to un-brick my phone

Have you been on this state. BSOD (Black Screen Of Death) logo.

What should I do?

1. If you have the 3 button combo available then try the download mode combo (Volume Down + Home + Power button). 
2. If nothing happen. Remove your battery for 2-5 minutes and put it back
3. Try again to enter download mode

4. If the above options do work, then what you need to do next is get ODIN up and running and flash with an appropriate firmware.