PC Won't Turn On After Taking out the GPU

Hey everyone,

I took out the GPU in order to change the thermal paste on it.

However after putting everything back in, PC shows no signs of life.

What the hell do I do now? It's a 5 year old PC and I use it for whatever so it's that serious, but still, it was a good PC.

I thankfully do have my main PC still working though and I avoid to take it apart. I was experimenting with the old one.

Specs: B550 Phantom Gaming 4 a/c RTX 3060 Ti 32GB DDR4 3600MHz 650W Corsair PSU AMD Ryzen 5 5600X

I was benchmarking Valorant in order to heat up the PC. GPU was reaching 88 degrees and I said that it was time to change the paste. I turn it off, unplug it and take out the gpu, changing the paste. May have put too much paste, not sure.