Integrated graphics

[Aleks112]

I have desktop OMEN 30l with Intel Core i9-11900K. Specification for my device (https://support.hp.com/my-en/product/omen-30l-desktop-pc-gt13-1000i/2100000185/model/2100000190/docu...) states that it has integrated graphics Intel UHD Graphics 750. I'd like to use it. I removed discrete video card (due Integrated video is not available if a graphics card is installed), plugged monitor and run computer. But it doesn't work. No signal to monitor, no startup screen, nothing. I get 3 long beeps and then 3 short beeps. Why it happens? What is correct way to use integrated video? Is it possible to run computer with integrated graphics  (without discrete card)? This motherboard has no video outputs (like display port or hdmi) so i used type-c to hdmi cable. I expect motherboard with integrated graphics enabled transfers video signal through type-c (thunderbold-like).  May be I'm wrong. Please explain correct way for using integrated graphics. Specification states that this desktop has integrated graphics but i can't use it.

[itsmyname]

@Aleks112 --  I get 3 long beeps and then 3 short beeps. Why it happens?  This motherboard has no video outputs.

Weird that it has integrated graphics, but no connector to connect a video-cable.  How could that work?

Shutdown the computer.

Disconnect the AC power.

Check that the sticks of RAM are fully "seated" in their sockets.

Reconnect the add-in graphics adapter card.

Enter BIOS SETUP, and see if you can configure the motherboard to use the integrated adapter as the "primary" video, instead of the add-in card.

Save/Exit and then shutdown your computer.

Disconnect the AC power.

Remove the card.

Connect the AC power.

Does it now restart properly, without any "beeps" ?