Why is my laptop not turning on after hinge replacement?

I recently replaced the hinges on a Dell Inspiron 7500 series 2-in-1 laptop. Was working fine before I swapped them out. Watt meter is showing 3 to 4 watts when laptop AC adapter is plugged in. No power/charging LED indicators, keyboard lights and obviously nothing happens when I push the power button. I've tried two different (known good) power adapters and even replaced the internal DC power cable from the jack to the MOBO. Anything helps.