Hi there - I just experienced this problem with a Pentax Optio S30 (it appears to be pretty common). The fix I discovered (that works), is to insert your batteries (make sure they're fresh), and then press and hold the "on" button plus "Menu" button, together at the same time. Hold until the firmware resets (a message will pop up on screen and the camera will reset). Voila! It works again for as long as the batteries are in and operational. Also note that in my case, if the batteries are taken out, I have to go thru the reset process again, but at least I have the camera back up and running. Hope this helps others!!
Please try new battery on your camera. If still depleted, the problem is on your camera and need to fix at dealer /repair shop.
Regards
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