Looking at your video, you could have damaged your CPU/motherboard. Your cpu isn't "locked in" as it's rocking around from your finger pushing it to turn the system on and off. That shouldn't be done even to test your idea. It's turning off on and from the intermittent contact w/ pins and pads. You may have bent the pins in the socket damaging the board, cpu, or both doing something like that. For your question, did you remove the GPU heatsink from the card itself, or just remove the card and clean it w/ canned air? I would remount CPU cooler w/ new thermal compound, reseat the ram making sure it's lined up correctly and clicks into place, reinstall videocard making gold contacts are inside PCI-E socket the whole way, which they...