Replaced Nexus 7 1st gen screen and digitizier, screen is completely black. How can I fix this?

[AC Question]

Replaced Nexus 7 1st gen screen and digitizier, screen is completely black

I know the tablet has power since my pc reads it fine when connected via USB. I thought it was the screen at first, so the company I purchased it from took the return and sent me a new one. Same issue.