Originally posted by Joakim-new . This is tested with and without lens in Av, Tv, and P settings with plenty of light, no flash needed.
Test it in M mode and put the camera into manual focus. Set the drive mode to Hi Continuous. Set the shutter speed to 1/125, ISO 100 and f/5.6 -- it doesn't matter if the pictures look good. Just rule out a basic setting error.
Make sure you have a quality memory card that can handle that type of input. I always buy Sandisk's fastest cards that are somewhere around 45Mb/s.