My GK head all of a sudden is non responsive. It won't power up..all of the obvious things have been checked..it has power, speakon adapter/speaker cable and cab are fine. The manual says is has a "self protecting" shoutdown feature when something is wired incorrectly. It's like it won't reset. the power light did flicker red for a second while powering on and then nothing...not sure how to proceed..unit is practically new and never left the basement..used it 2 days ago without problems at home volume...hmmmmmm anybody out there have any suggestions?