DVI cable no signal until OS

[erftoerdem8153502db]

Board : MSI-H81M-P33

I switched from vga to a dvı cable but i cant get into bios,i get no signal until os launches.
When i connect it to graphics card it works fine but i need to connect monitor to igpu,motherboard port
İ installed the latest 2018 bios for it.How can i boot from igpu ?

Thanks.

 

[erftoerdem8153502db]

So i changed primary boot device from external to igpu and its ok now

PEG -> IGD

Thanks.