My Pentax K-X was working fine until I changed the lens on it. Now it will not focus or release the shutter even with the orginal lens on it. Other functions seem to be working fine. What could be causing this problem?

[Adam]

My Pentax K-X was working fine until I changed the lens on it. Now it will not focus or release the shutter even with the orginal lens on it. Other functions seem to be working fine. What could be causing this problem?

Is it a manual lens? If so, make sure the aperture ring is set to "A", or see this article: https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-meter...k-x-k-7-a.html

If not, then try cleaning the lens mount as well as the contacts on the lens itself.

Both lens a auto focus lens.

[sergysergy]

Clean the contacts and make sure the lens went all the way in.