Searched many sites, tried many suggestions. Issue is GPU on PCI slot not detected for Dell OptiPlex 990 using Win10 Pro. The GPU is EVGA GTX960. Installed PSU as well at 550 Watts. The BIOS does not let you to disable the integrated video card. I have done the following.. updated BIOS, reinserted GPU, uninstalled driver and disabled and disconnected cable to integrated video, and tried to use CMD bcdedit/set pciexpress forcedisable.
When booting up new GPU van turns on but then turns off.