power steering ! whining noise??

hi, just wanted to no my power steering used to make a whining when on full lock, no problem i thought..
now it makes this noise when im turning really slowly and the steering goes stiff not bad nut its getting worse, is it the pump on its way out?
fthe fluid is max, or could be the fluid been old ?????

please help!
cheers stables..

You'll probably find changing the fluid will fix it.

NEVA keep yer steering at full lock against the stops.....not even for 2 secs.....bad bad habit.....when ya reach full lock, jus back it orf a few degrees