No power response, cable and outlet are good

hi there,
have you seen or heard the fan moving,if that so it may be power supply,unsle you have a tester
to measure the output supply from power supply. try to open the cover of your cpu on side corner there are two lock in bolt,loosening this and slide pull backward to open,on figure as sample the location of quick lock bolt.
then inside your cpu,you can see power supply
there is a specification tabulated on side of pwer supply.on figures you can see.on the arrow pointing power supply. on your cpu you can read the specification
of your power supply take note on this.when you buy new power supply just let them know,mostly
the capacity they will ask you e.g. 450 watts.have a nice day,don't forget to rate me.

ps
removing power on figure you can see cable from power supply going to mother board disconnect them from terminals such as hardisk,cd room.floopy,motherboard,and the sccrew on the backside of cpu.