Loading optimized defaults might bring back the default onboard graphics setting.
Enter the bios as normal by pressing the ESC or F2 key immediately after turning on the power.
When it's apparent that you're in the bios, press F5 to load optimized defaults, then press the Enter key.
Pressing the Enter key is saying yes to the option to load optimized defaults.
Intel i9 10850K@ 5.3GHz
ASUS ROG Strix Z490-E
Corsair H115i Pro XT
G.Skill TridentZ@ 3600MHz CL14 2x16GB
EVGA RTX 3090 Ti FWT3 Ultra
OS: WD Black SN850 1TB NVMe M.2
Storage: WD Blue SN550 2TB NVMe M.2
EVGA SuperNova 1200 P2
ASUS ROG Strix Helios GX601