I have a Jensen 500 watt amp, and it usually works fine but today it started doing something weird. The Power light turns green and it will work for a split second then it turns to yellow and then to red. It just keeps doing that over and over stopping for a split second on each color. I checked all the connections to it and they appear to be fine, including the ground connection. Can someone please help me out with this problem? Thanx in advance.