New X299 Killer SLI/AC don't boot.

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   Hi, (forgive my bad english) I just assembled a new PC with:
Mainboard: AsRock X299 Killer SLI/AC
CPU: Intel  i7-7800x
SSD: Samsung 950-PRO M.2 
RAM: 32GB Corsair Vengeance DDR4-3000 (4x8gb, running yet at "bios default" 2133 for now)
GPU: Aorus NVidia GTX1080ti GPU.
PSU: EVGA Supernova G3 850w

The SSD already contained an operating system, and the very first time I powered the PC it booted correctly, but when I rebooted the PC for the first time, it no longer booted up.

The PC start up, the bios works fine, but it won't load the OS..
Then I tried to boot from a USB KEY with Win10 installation, and with Win10 original CD, but when I press F11 to select boot unit, and I select any unit, the screen goes black and don't boot anything.

I even tried to update BIOS via "internet flash", it found a FW update (1.20), but when I try to update it, the process fail, with "secure flash check fail!" error.

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Bestio Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 10 Oct 2017 Location: Italy Status: Offline Points: 8	Post Options Post Reply Quote Bestio Report Post Thanks(0) Quote Reply Topic: New X299 Killer SLI/AC don't boot. Posted: 10 Oct 2017 at 1:39am
	Hi, (forgive my bad english) I just assembled a new PC with: Mainboard: AsRock X299 Killer SLI/AC CPU: Intel i7-7800x SSD: Samsung 950-PRO M.2 RAM: 32GB Corsair Vengeance DDR4-3000 (4x8gb, running yet at "bios default" 2133 for now) GPU: Aorus NVidia GTX1080ti GPU. PSU: EVGA Supernova G3 850w The SSD already contained an operating system, and the very first time I powered the PC it booted correctly, but when I rebooted the PC for the first time, it no longer booted up. The PC start up, the bios works fine, but it won't load the OS.. Then I tried to boot from a USB KEY with Win10 installation, and with Win10 original CD, but when I press F11 to select boot unit, and I select any unit, the screen goes black and don't boot anything. I even tried to update BIOS via "internet flash", it found a FW update (1.20), but when I try to update it, the process fail, with "secure flash check fail!" error.

Bestio Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 10 Oct 2017 Location: Italy Status: Offline Points: 8	Post Options Post Reply Quote Bestio Report Post Thanks(0) Quote Reply Posted: 20 Oct 2017 at 10:50pm
	After a week, no reply from Asrock support email about this issue. I have no choice but to return the mainboard and never buy asrock Again. Issues can happen, but total lack of support is unacceptable.