CANT GET POWER FOR MY SYSTEM

Make sure you check all the fuses, this means the fuses on the radio Red and or yellow wire, the ones in your fuse panel, The ones under the hood, (if any) the fuses in or connected to your amp. The best way to do this if you do not have a volt / ohm meter is to buy new fuses of each typ used in your sustem and just swap them out. As you say your whole system is dead including the Head Unit (radio) after replacing the fuses you will need to check to see if all the wires to the radio are still properly connected especially the grounds. If every thing above checks out then you have a dead radio and it will need to be replaced. Again as you say the WHOLE SYSTEM is out I assume you mean the radio as well.