Headunit power help

Ok sorry I am a computer engineering major so I tend to start with basics with people that are doing the work and not myself, makes things a whole lot simpler. Trust me you have no idea how many people call tech support for computers cause their machines will not turn on and they didn't even have the CPU plugged in.

Ok so lets start by testing the speakers and see if they are getting power. If they are getting power, check all your fuses and make sure none are blown or that they are all pushed inside the fuse holder. Sounds like a dumb thing to do but, believe it or not I have seen this happen, still have yet to figure out why but hey since we know its a possiblity why not try it.