For some reason some people want to know what God sounds like. If God is talking to you in your head then you might be crazy or if you hear any voices for that matter. Me I just have a demon/fallen angel in my head, it is the only way for an angel to stay here :P. I am just kidding of course.
I was not a believer until I was almost done with my physics theory. It was only when I had fought, struggled for knowledge, understanding, etc. and could hold the universe in my hand that I started to believe. As I sat in amazement at the universe gazing at it, I looked over to my side and there was God. I knew that he had created everything I was looking at.
What does he look like then? God created man in his own image :P. I can tell you he is the light, and it is quite bright and warm. There is no doubt who he is. Seeing is not really the right term, knowing is better imo.