Inspiron 15 3511 - Laptop won't turn on

For a backstory, I recently had to change the back lcd cover of this laptop as the hinges were too tight and completely ripped off the plastic holding the back cover together with the front of the screen. This isn't my first repair for this issue and the other ones have been successful thus far. Now for this one, After making those changes, and reconnecting the parts back it refused to turn on. This meant, no fan activity, no backlight, not even the caps lock. At first, i thought maybe it was the power, plugged it in, the LED showed a faint white blinking light, constantly blinking. I left it overnight to charge in case the battery was drained but this morning still the same status. 

I've tried draining the power, resetting the clock, swapped out the battery for another working laptop's battery, tested with another ac adapter and nothing. When I hold the power button down the LED light goes into a solid white but only for the length of time i am holding the power button.  I'm hoping it is not the motherboard hence the post but all suggestions are appreciated. 

I even tried turning it off without a ram and storage connected. Looked for burn components and loose components and have found absolutely nothing. Thank you!