I had a service a few months back, but ever since then my power steering has been making screeching noises every time I make a turn. I kept going back to the garage (solo mechanic) and asking about it, but he said it wasn't doing any harm. Someone in a car park heard it and said it was the power steering fluid.

I checked the fluid and it was low, but even after topping it up the car still makes a grinding noise. What long term damage might I have done and could the whirring be connected too? I have been driving it with the screeching for about two months.