I need some troubleshooting advice. My STi (Serial #511461) stopped taking images last night. It seems like the shutter was not opening. Here are some details: Using Maxim DL-Pro, the com-link to the STi was successful. The camera seemed to perform all of the functions (expose, guide, etc) with no issues or error messages, but all of the images were blank except for the backgtround noise. I could not hear the shutter clicking. I noiticed that the green light on the camera was not consistently staying illuminated, and when I wiggled the USB cable it would light, but if the cable shifted it would go out. Even when the light was not illuminated I never lost the com-link to the camera, and I never received any error messages or saw any indication that the communication was lost. Is there anything else I need to look at ? I am hoping that this is just a bad cable. Are commercially available USB A to B cables suitable ?