My Samsung Galaxy Ace GT-S5830 has just “hung” during the start-up screen with the white text “Samsung www.samsung.com" on a black background.
I have tried to restart it and to take the battery out / put it in again but the result is the same. It neither goes into Download Mode (vol down+menu+power button) nor RAM Dump Mode (vol up+power button).
Does anyone have any suggestions or advice on how to fix this?