I have a shanling PH1000 and a hi-fi digital audio Super Pro Dac. It is connected with tributary interconnects and they power my HD 600's. It has all been working just fine until about a month ago. The dac has two lights on them called Power on which lights up, and a light above that called Normal. That Normal light is not on anymore, and when it does come on, it produces sound. Unfortunately now the only way to make that light come on is to bang on the dac or to twist the power jack going into it til it happens to work. How can I fix this? My headphones only produce static now because of this dac (I think). Here are a few pics, but don't know if this will help in diagnosing the problem. If there's anything I can tell you, let me know and I'll reply. Thanks!