Apple Logo shows for 5 seconds then shuts off after digitizer change

I changed the display, home button, and rear camera on an iPad 5 and now when I turn it on, the Apple logo comes on for 5 seconds then goes away and only the backlight stays on.

I have taken the device back apart several times to make sure that all the connections are clean and properly plugged in, but it still acts like this.

What am I missing or where do I go from here?

Everything worked good on it when it was brought to me, minus the digitizer being broken..

Thank you.