Bought new motherboard and connectes. The pc turn on but not screen

May 10, 2018
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I bough new mother board asus rog strix b360-h gaming and i connected what i think was connected on last motherboard. Everything works perfectly but screen does not turn on. Can i get some help asap please
https://imgur.com/a/bNk60Vv
I bought motherboard and cpu intel i5 8400 but i dont think problem is in that
Or is it maybe cuz my only harddrive is connected to sata 6g 3
Not 1??
Sorry the screen just turned on but ic i didnt clear my hDd do i have to instal new windows now? While we are at it now i didnt touch anythibg in bios and i press save and exit
And then after few seconds the bois opens again. I press tge boot menu and it says. The system cannot fins any bootable devices. Can it be that i connected my hdd to sata6g_3 instead of one?