iphone 4 disabled

my iPhone 4 verizon 16GB that I bought from someone, is Disabled saying to connect to iTunes. Im trying to restore it but I can't. I had tried different ways to restore it. I tried the power/wake button with connector and still nothing. When trying to put in DFU mode the iTunes logo disappears and a line goes right through it. Does anyone knows how to restore the iPhone with these issues?