Dell 7910 issues gpu

Hi you help me long time ago and much apriciated i have new dell 7910 that was used as server I it come with 8tb sas drives with raid card I removed all the HD and raid card did a bios update and reset of system DBE clean the fan and cpu new paste removed memory and connected one ssd my issue is that dell come with ati fire pro gpu barco mxrt 7500 it one of those medical gpus now I when I am installing windows or going in to bios etc screen is fine but few min in to windows I loose picture on my mother board green led light is blinking on and off green colour I tried 2 gpus but monitor. Will go in to power save mode I tried different monitor connections I did get the older gpu to work but when I installed drivers for it screen went in to sleep mode now fire pro card is working but it might turn off as soon as I install drivers this green led light fleshing at bottom Right side of motherboard did some research and it say that might be issue with power module  service tag