Mac won't power up after replacing upper case

I just followed the step by step instructions on replacing the upper case. After completing the project, the Mac won't power up. I understand that others have had the same problem. The Mac was working fine before except that I had to use a USB keyboard since liquid spilled on my keys. The USB keyboard overrode the normal keyboard so thats how I was able to get by.

When I attach the charger, the green light stays on instead of switching to orange to indicate charging. But even with the charger attached, it does not turn on.

In theory the computer should be working the same as before, except with a new functional keyboard right?