I purchased a complete C-4 set up last year and have never used it. I was going to sell it because of down sizing and want to be sure all is fine. Plugged in the power cord and hit the power on, meter lights up and all, but when I release the power button, the unit shuts off. Is this because I have it by itself and not hooked to the rest of the set up or a possoble problem? Tim k1syn