I've been running my STT8300 without problems for quite some time. Tonight the cooling stopped working completely. While software (MaxImDL, TheSkyX CAO, CCDOps) showed 100% cooling, and the dual fans were clearly operating, the temperature would not budge from ambient, despite being set for -30C. Up until today, I had been successfully using a power supply set to 14 volts because of an extended length of cord on the DC side, and able to deliver 5 amps. Tonight I tried the original 12 volt power supply. The problem remained. The LED lights on the side showed just green, or green and one orange. Does this indicate problems with both power supplies? I note from the manual that there is a "user accessible fuse" that might have blown, but everything else about the camera - taking an image, filter wheel changes, guiding with an AO - seems to work fine. Any suggestions about what I could do about getting up and running again?