I have 2006 Buick rendezous. There is creaking groaning sound from the front end. the sound doesn't start until the car has been operating for 15 min. It only occurrs when I start moving from a stand still then disappears in about 5 sec. Doesn't matter if the wheel is straight or I am turning. The noise last a little longer if I am turning either left or right. I have repalced the ball joints, outter tie rods, studs and stud bearing, the brushings in the lower control arms.

you check the power steering fluid and for leaks in the rack/pump?

Possibly bearings??? Jack the front end up and feel for play in the wheels.