Not sure if they sale a replacement button for your case you would need to check with the manufacturer of the case you have. In the mean time you can use a screwdriver to "Hot-Wire" your pc. I had to do this years ago on one of my computers just connect the screwdriver so it jumps the power and ground pins the button connects to on the motherboard. Or you could buy a switch/button from a store and make your own power button, they are very basic devices.