I have the Opus 120 and I had the same thing happen. Take a volt meter and the Yellow lead on your power supply should be 12volts DC. The Red should be 5v DC. I was getting 5v on the red but only .4 on the yellow. My board would turn on but I would get no post. I bet your seeing the same problem. It's worth checking, Opus worked with me and said the powersupply was good, but I had to argue a little with them. They sent me a replacement and all is well.