I'm getting a high pitched whinning noise now, when I start the car up its starts and then quietens down, but as soon as I turn the steering wheel the noise gets higher again and then quietens down again after a couple of seconds, and so on.
The noise sounds almost definately like its from the power steering pump/resorvoir. I have topped up the power steering fluid, as I wondered if the fluid had gotten too low and hence the noise. But the noise is still there now.
The only other theory is that the noise only started after I had the gearbox replaced last weekend, so could it be possible that something on the pump or something connected to it may have been knocked and caused it?!