[Nguyenm0629]

Hello, I disconnected the cluster for misc reasons and now when I reconnect everything as it was: first, the cluster didn’t power on (although the center console did) now after a few tries, the entire car won’t start with zero power on the cluster and center. I tried to charge the battery and it seems to not be an issue with battery. Not sure what happened, but any advice on how to fix? 2014 Aventador

 

[DXM31]

Disclaimer: I have never taken the gauge cluster out of an Aventador.
Check the easiest things first. Like do you have good ground at the battery. Check fuses. Since nothing is working it sounds like a grounding issue. You could also unplug and replug the connections you have had apart. After checking the obvious stuff, it's time to get your ohmmeter out and see where the power stops.

 

[Konnor1212]

Did you use the push-start? if you did that try sticking the key fob into the slot and try to start the car.