Computer starts, but screen never receives input

Hello, I recently had to install a new water cooling unit as my old one broke and had been overheating the cpu. After installation, starting the computer just brings a black screen. Windows never pops up, it’s just always black but the computer makes the start up beep like any normals startup and stays on until I turn it off.

I’ve checked all of the cables for everything, tried turning on and off again, tried taking dvi in and out and such and such, tried looking at each aspect and no luck anywhere.

Please help, I use my computer a lot and don’t want to have just wasted $80