I just bought a used Hifonics BX1500 for my sub, and i just installed it with my friend, we havent installed any amps before but together we got everything connected to the sub (12" Orion H2). Now theres like 6 settings u can adjust on the amp but i didnt kno what they did so i left them. Uhh i turned my car on and the sub worked but then i turned my car off and on again right then and the amp dosent turn on... no lights or anyhting...idk what should i check?? The shut off when i turned the music on...it just randomly shut off.. ANY IDEAS??? If you need to know anything else to help me please ask.