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I remember reading a review of the K100D that mentioned that it had poor low light performance. I know mine has a really hard time focusing in low light situations. It does the sweeping back and forth & most of the time never ends up taking a picture. (Even when it bursts the flash to try to focus.)
I've just started experimenting by using a flash light aimed at the subject I want to focus in low light situations, and the camera seems to be able to focus & take a shot more reliably.
If this works, I'm going to rig up something to hold the flash light underneath the camera so that I can use it more often.
This happened to me once on a D70... When mounting the lens, make sure it clicks in all the way when turning counterclockwise. Also it may be worthy to note that both the lens AND the camera must be set to autofocus mode ("A" switch set on both lens and cam).
I don't know for sure, but it sounds like it could be a memory card problem. Have you tried it with another card or no card at all?
My S4i froze up completely from a bad sd card. The green power button would light up, but nothing else would happen. Pentax recommends Lexar or Panasonic sd cards from what I have heard. My new Lexar card hasn't had any issues.