Is the drive belt still on, this is assuming it is a mechanical pump not an electric one. Regards Peter

its most likly the power steering pump gone or possible rack but they can be fixd quite cheap with power steering services check them out

Is there any fluid pumping round the system? Usually you can tell by looking in the reservoir cap with the system running - you should be able to discern the fluid flowing.

Is there any assistance in either direction?

Sounds suspiciously like a blockage in th evalve block (or a valve stuck shut). How much trouble is it to drop the rack out on one of these?