MacPro Boots to White Screen After Battery Replacement

Hey y’all,

so I changed out my battery and my Display LVDS cable…tried turning my computer on, and lo and behold, my computer is starting up to an eery white screen and won’t show a charge (Mac charger showing no LED). I’ve tried reseting the SMS, PVRAM, RAM, what have you. Any help?

I have a Pro Retina A1398 Mid 2015 15”