Being an idiot, I accidentally got Deoxit D5 in my ribbon cable slot (being too slopping cleaning my shoulder buttons). I didn't realize it until I turned the the SP on and the screen was off. For a second it's the normal brightness, then the screen dims and the pixels sort of flicker. I dried out the slot and cleaned the ribbon cable itself, but I still have the same issue. I want to try to clean the ribbon cable before giving up and using this SP for backup parts in the future.