This X99 PR9 Motherboard does not support i7-5820K and you will meet the issue of no display with this processor.
Support Memory Type: 4 x DDR4 DIMM
Maximum Memory Capacity: 128 GB
Memory Channel: Dual Channel Mode
LAN: Realtek 8111H 1000Mbps RJ45 Ethernet
Audio: Realtek ALC897 chip, 2.1 Channels
PCIe: 1 x PCIe 3.0 x 16, 1 x PCIe 2.0 x 1
Storage: 3x SATA 3.0 prots, 1x M.2 slot (Support SATA(NGFF)/NVMe M.2)
Power Supply: The Intel x99 motherboard adopts a 6-phase power supply
Applicable Hard Disk: Supports 2.5-inch SATA SSD, 3.5-inch HDD, MVME M.2 SSD, SATA M.2 SSD.
Enter BIOS: Turn the computer motherboards on, and press the main "DEL" key continuously.
Quick Boot Button: F11 - Turn the x99 matx motherboard on, and press the F11 key continuously.
M.2 Mode Switching: Support NVME M.2 or SATA(NGFF) M.2, default mode is NVME M.2;