During POST my monitors do not receive any video signal. The displays only receive signal once the Windows 10 Login screen appears. As a result I am unable to enter the UEFI menu. I tried repeatedly tapping the Del key, which is supposed to be the key that takes you into the UEFI menu, during startup. I've also tried to enter BIOS using the "Start > Power > Shift + Reset and then Navigating to the option that boots to UEFI" method. It still only ends up showing the Windows login screen. Can you please help me to diagnose the problem?
Config:
CPU: i5 10600
Motherboard: Gigabyte Z490 VISION D
RAM: 32 GB (16x2) 3200 MHz G.Skill Trident Royals
GPU: Gigabyte Xtreme Gaming GTX 1070
OS SSD: Samsung 970 Evo M.2 500 GB
Primary Monitor: Dell U2720Q UltraSharp 4K 60 Hz (Connected via DP)
Secondary Monitor: Asus VG279QM 1080p 240Hz (Connected via DP)