Sharp LC32GA6E HD Problems

I have a sharp lc32ga6e HD tv. first problem is I cannot get my ps3 to hook up to the tv via HDMI, all i get is a black screen. I've tried everything I can think of. Second problem is that i get a ghosting on the screen when using the ps3 with component cable to get HD. I've had to connect everything with component cables (except my sky HD box which is HDMI) and i don't know if there's a setting which I have to change. Also tried everything. Can someone help. Please