Question System Won't Boot Without Monitor Connected

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Aug 31, 2013
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Hey Guys
I noticed something today and it's wired to me.
I have a z390-A prime with gtx 1070 ti and a core i7 8100.
If there is no monitor connected to the graphic cards (neither Gtx nor intel) system beep and doesn't boot up but if I connect any monitor to one of them then system boots up.
I saw before that i can start a computer without any monitor connected but here it seem weird to me.
I also select pcie as the primary gpu but it still persist.
What i can do if i want to start my computer without a monitor
 
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