I'm working on installing a new stereo in my boat, and am having an issue. It's an 80wx4 channel stereo and I have it hooked up with just two back speakers. Once I wire everything together and turn the ignition on, the stereo lights up for about 5-10 seconds, and then shuts itself off. I can't turn it back on after it does this. Can't operate it either for the few seconds it lights up either. What should I do?