Not booting

disjudge wrote: I have a z270 extreme4 with an i7 7700k. When I turn it on the lights on the mobo flash blue and all the fans begin spinning but when I try to go to BIOS there is nothing on the display. The system is responding to key board input. I know this because when I hit ctl + alt + dl there is a change in fan speed. I have tried two different monitors using both vga and hdmi. I have tried everything that I know of, short of taking it apart and putting it back together.

So this PC was working and booting Windows at one time? But now it is behaving as you described?

Or have you just started this PC for the first time?

Are you using a video card, or the Intel iGPU?

Have you tried clearing the UEFI/CMOS with the jumper on the board?

disjudge wrote: I am booting it for the first time and I am using a Gigabyte Geforce GTX 1070. And I have not tried clearing the UEFI/CMOS.

If you don't have an OS installed, then you are not booting anything, just attempting to see if your hardware completes POST, and can get into the UEFI/BIOS.

Do you have both the 24 pin power cable, and the 4/8 pin CPU power cable from the PSU connected to the board? Both are required or the CPU will not work.

I would check that the video card is seated in the PCIe slot correctly. Did you lock the card into place with the locking tab on the PCIe slot?

You might have a bad video card, rare but it can happen. All necessary power cables connected to the 1070?

For a test, you could remove the video card and connect the monitor to the Intel graphics on the IO panel. If you then get a signal to the monitor, the video card may be bad.