1 - turn phone off.
2 - hold down home button.
3 - whilst still holding down home button hold the power button down to turn phone on.
4 - when you see samsunbg logo let go off pwoer button but keep holding home button.
5 - when you see recovery menu can let go of home button.
hope this helps.
This worked a charm for me, I was gutted thinking my phone was bricked and there was nothing I could do, untill I found this answer. Thank you so much! - Now I can charge other people and fix theirs too..xxx