I carry my camera in a case and treat it as most field photographers usually do. For some odd reason, my built-in flash won't fire. It keeps clicking even though the first click pops the light up. After that, the camera still thinks that the flash hasn't popped up and continues to click when I press either the shoot button or the flash button. Did my flash burn out? Or is there a mechanism that is stuck in the pop-up flash that I can easily dislodge?