I don't really know what is wrong. I bought my controller board about a month ago or so, put it together and testit out. At the time I didn't have a power supply so I just used a 12V battery that I happened to have. I hooked two of my motors up and ran Mach's roadrunner gcode and everything worked great! About a week ago I finished my power supply and hooked one of the motors up and did the same test and again it all worked great. The other day I finished connecting the motors up with some cable and connected them to the power supply. I actually hooked up all three motors (2 EAD's and 1 keling). I've been looking around the forum and realized that I had the keling motor wired up wrong but at the time I didn't know it all I knew was that it didn't work so I tried it on all of the axes. Now none of them work and the LM31 (U5) on the board gets really hot. I check for 5V at the test point and the voltage slowly drops. Is this beyond repair? Does anyone know what is wrong? I tried to sign up for the Hobbycnc yahoo group but was denied. I thought that the criteria for the group was to have purchased a board from them? Anyway I hope that this post is coherent. I have been a long time "looker" but this is my first time posting. I thoroughly enjoy this forum. Thanks.