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MBP stuck at white screen when booting

Hey guys, I followed the "replace heat sink" guide to clean out my fan and replace the thermal compound. While replacing the logic board, the trackpad ribbon got caught and was severed, so I removed the cut half. When I tried to boot up the laptop, I got a white screen after the superdrive rev sound. I use bootcamp so there's normally no logo and no Mac chime.

No startup commands are responsive and the laptop just runs with the fan at full speed. If I hit the power button, the laptop instantly shuts off. I've double checked all connections and tried swapping the ram (white screen still) as well as completely removing them (which produces a black screen with beeps). Any idea what the issue is here?

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Did another reassembly to see if the laptop would load without the battery connected. Startup took a few seconds longer to reach the white screen. After reattaching the battery and putting everything back in place, I tried to boot again to do a PRAM reset. The command was ignored and instead booted straight to the Windows login screen. However, the keyboard wasn't responsive (probably due to holding keys down for too long at startup). After restarting the laptop, I got the WSOD again.

Will leave battery disconnected from logic board for a good 15 minutes to see if that works.

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Left the logic board unplugged from the battery for an hour. Put everything back together and the laptop booted to windows as expected. The keyboard still wasn't functioning however and after a moment at the login screen, a blue screen popped up with an error about applemtp.sys and "driver_unloaded_without_canceling_pending_operations". Google suggests this is a bootcamp driver issue regarding the trackpad and right clicking. My bootcamp drivers are up-to-date though and I've never had this bsod error. Perhaps the severed trackpad ribbon is causing this? It doesn't explain the keyboard issue though.

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PRAM reset worked this time. I got to the Windows login page and had to use the virtual keyboard to login. Everything feels sluggish. There's an intermittent split second freeze every 5-7 seconds. Keyboard does not work in either OS and mouse clicks are not responding in Mac OS. The laptop only boots up properly when I use the PRAM combination, otherwise it remains a white screen.

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