Sorry I haven't replied in a while. Thank you all so much for your support and advice, but even after wiring up the tact switch between the MX Chip and GND, I still wasn't able to get it to boot. I think I accidentally ripped out a copper trace on a different part of the motherboard, and that's keeping it from turning on. I don't think this thing will be playing GameCube games anytime soon, but If I get it to work, it'll be the perfect subject to replace the old Wii I broke while trying to make my portable. Also, I made a YouTube video sort of documenting this entire process (sorry this sounds like a plug) if you want to see it. Here's the link Thanks to everyone who helped give advice on this project, even if I didn't get the results I was hoping for. See you in the next build!