I was having problems entering the BIOS on a 5810 and ended up putting it through a factory reset. More specifically, the GPU (NVIDIA Quadro P4000) refused to output until the windows startup screen (no dell logo or anything), and If it forced into BIOs, the GPU would not output until the computer was restarted.

Since the factory reset, the GPU no longer outputs at all as I presume it doesn't make it past startup. I have tried:

1. Using all of the DP outputs on the GPU with two different display port cables, both of which work on other systems
2. Two different monitors, which also work on other systems
3. Three different hard drives with windows on them.
4. Reseating the GPU
5. Reseating the GPU in a different PCIe slot
6. Using f8 to boot into safe mode

And still, the power button and fans turn on like nothing is wrong. From my understanding, there is no onboard mobo graphics, so the only video output is the 4 display ports on the GPU.