Question Pc no display on monitor doesn’t power off with power button some case fans work other don’t

Dec 8, 2019
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Hi guys, I recently built a new computer it’s specs are
I7 9700k
Asus right Strix z390-e
16gb 3000mhz Corsair vengeance ram
850w 80 plus gold Seasonic psu
Asus rog Strix 2080ti
I’m building in the nzxt h710i
My problem is that my system fully powers up with 1 short beep, no display on monitor through HDMI as at the moment I don’t have my new monitor. My power button turns the pc on but not off. All components seem to have power. My front 3 120mm case fans start to spin up when I power on then will stop but my 140mm exhaust fan does work perfectly. My nzxt x72 works perfectly fine plugged right into the motherboard. I can’t seem to find the issue I’ve gone through the checklist please help. Thank you for your time.