Originally posted by foxhead Before you send it back try this. With the lens mounted, both body and lens switches in AF position and the camera turned on, press the shutter release half way while rotating the focus ring on the lens.
I have three SDM lenses and this procedure seems to wake them up after having not been used for a while. I have no idea why, but it has always worked for me.
Even if this worked, it would worry me to have a brand new lens that required this procedure and i would send the lens back. I don't need to do this to either of my DA * lenses to wake them up.