My amp turn on but for some reason it dosent push out any power to the sub

Make sure there is not an input level control and that you have the right RCA connectors from the head unit connected. If you do see an input control first see from the head unit specs on what the max. output is comming out from the head units VIA the RCA Plugs. then see from the amp specs what the max. input should be inputted to the amp . If the output from the head unit is higher then the allowed input from the amp, your going to blow up the amp the first time you crank it. I have seen this happen many times. if you do not know how to balace the input of the amp please read the instructions on the amp or seek a professionals assistance.