I'm using clonezilla to image a few macbooks with identical specs. However, only the macbook with the original installation from which the image is created boots normally. The other macbooks that I image with clonezilla boot up with 10 seconds of grey screen before the apple logo appears. The macbook wiith the original install boots directly to the apple logo, no pause after power on. What goes on here? If the hardware is the same, why do the imaged machines hang on boot? Thanks in advance.