to be credible to send a lot of transition in the forum ????
Take off the battery for 10 seconds and try again.
Do you still get the Samsung logo when you start up?
You are aware that you have to press <VOL-UP>+<HOME>+<POWER> or <VOL-DOWN>+<HOME>+<POWER>? Some people are sometimes confused by <VOL-UP>+<POWER> only.
Tell me exactly what you see and i will help as far as i could