I JB my iphone 3g. used redsn0w. 4.2.1

all seemed to go fine.

However, when I connect the USB and open iexplorer it can't see the iphone, I didn't install SSH - just cydia, which I thought is all that's needed. is there something else I need?

On a second note, i still get the apple logo when the phone, starts, I was expecting to see a pineapple!