I want to play piano using my keyboard I believe it's possible but how?
I probably didn,t made myself clear 
I know how to play piano but the power plug is not working so I need to try some other ways until I fix it
Depends on what kind of set up you have at home and what kind of keyboard you have. I run my 'Triton' using 1/4 inch phono cables from the main audio output ports into one of my mixing channels. You can also bypass using a mixer if you have the right audio ports in the back of your PC. It really will depend on what ports are available on both your PC and Keyboard. There are numerous ways but I'd need more info. Also, you might have to let the program your working with know that you want to hear the sounds coming from your Keyboard (ex. enable the auxiliary stereo inputs/outputs on your recording program).
Adding on to what you said about no power…
Your probably gonna have to buy a new cord unless you can ghetto rig the one you have by splicing the cables and joining them at the problem area. I dint know if you can feed phantom power into a keyboard to supply it with power but I doubt it? But hey, i might be wrong.