My dahua NVR4108-4KS2 has just died on me it is only 6 months old, there is no power whatsoever, I have tried a different power supply and removed the hard drive, but it is absolutely dead, any suggestions to try before I send it back to China? as it will save me time and expense thank you..I updated the firmware about a week ago also but I don't think that's got anything to do with it because it's been working great for the last week since the update.