MDM Trouble Report for 2016 Mar 03 Telescope: 2.4m Observer(s): Liu, Charisi, Halpern (Columbia) Instrument: Modspec + Echelle Problem(s) Encountered: During one of our 30 min exposure, the slit viewing camera (Andor) stopped working. We tried few things but none helped solving the problem: (1) unplug and plug back in the camera's power (2) restart the Andor SOLIS software (3) under shutter control , we changed from permanently open to permanently closed and back to open. (4) we also tried to put flat lamp on, but the camera doesn't seem to get any light. Meanwhile, the guide camera, and the spectrograph are getting lights, as the observation of the object when this problem happened was done without problem. ------------------------------ Submitted on 2016 Mar 4 [3:54:11]