Xbox elite series 2 controller

I guess this is a longshot. Ive worked my fingers and mind to the bone trying to figure out why my controller will not turn on. So i originally pulled it apart to replace the sticks as one was broken. I was fairly innexperienced with my removal. But got it out and replaced. Put it all back together. Wont turn on. Openend it back up to see if i forgot anything. Nope. Not as far as i can see. Ive done it like 10 times now. Cleaning various parts checking for missing parts. Idk anymore. It now only shows a solid white profile led and nothing else turns on. With occasional whining sound coming from roughly center of the controller. Can anyone help me troubleshoot.