Problem installing NVIDIA 401.73 driver on CentOS 7.5

Hello Team,

I have attach to my graphics card Quadro P1000 into my server HP ML350 Gen10.

but when we are connected Via graphics card is before power is then display is coming after stared centos then showing please connect cable source could not be found.

so please provide me the steps so that my data could not be loss and working fine properly.

Thank You,