Not powering on after display replacement

Hi all,

Followed the screen replacement guide exactly, being super careful throughout the process. After I buttoned everything up, I opened the MBP, went to power it on and…..nothing. No fan spin, not a single sign of life. I tried re-seating the power cables, even went through and took it all back apart (twice) to ensure I put everything back exactly.

I attempted to do the SVC and NVRAM reset with no luck. While preforming these step, I had my dongle (nothing plugged into it) in the macbook and it has a small light that would cycle as I attempted to power cycle the MBP. I would “think” that it is something else but have no idea.

Any help would be greatly appreciated. Thanks.