On my version of maxim there are three radio buttons towards the right hand side of the guide window: expose; calibrate and track. Use the first to take an image, the second the start a calibration and the third to start guiding. The histogram will tidy up the image, but it usually reverts to snowy on the next exposure. I usually have success with it automatically selecting a guide star, so I just ignore the snowy picture.
DT
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