The files you gave me work flawlessly. Just go into system/sounds/power on then copy the name Metropcs-poweron.mp3, paste it to whichever mp3 you want to use then move it to that folder and override the existing file, viola!! Reboot and enjoy!! I'm sure you already know all this, but in case any on lookers want to try this out, it does work. Thanks again sir, and the OP for bringing this option to us.