2004 Honda Odyssey Sterio System

Interior problem
2004 Honda Odyssey 4 cyl 74250 miles

My system will not turn on and I am thinking it is a blown fuse but cannot find one. THe only thing extra in my van is that it has a dvd player added to it. Please help me figure out why I cannot get he system to turn on and how to fix it. The little anti theft light right above the cd player still blinks even when I am driving.