Check that your right steering lever isn't stuck in detent (stuck to the right). Jiggle it left to right and it should sit centre. If its stuck the oil will be going over the relief valve preventing you getting any oil pressure to the other functions.
If thats not it, i'd check your relief valve that is in the back of the control block. If there is something stuck in it you will not be able to generate any pressure as it just runs over the valve back to the tank.
If you have no drive issues i doubt it is the pump, but it could be a problem. Check the easy stuff first, then work to the more difficult/expensive stuff.