Two seperate motherboards do not boot, one in a boot loop the other shuts down after fans kick on.

Nov 7, 2018
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After a couple years my first motherboard, a Z270 UD3 got stuck in a boot loop with no beep codes, and before a splash screen.
I narrowed it down to not being the drive, graphics card, or the power supply.

I decided to buy a new motherboard, a Z370M DS3H as a replacement, and it does not boot up either, but this time it is not stuck in a loop. The fans turn on for half a second and it shuts down entirely.

I have tested the power supply and graphics card independently in another computer and they worked fine.

I have tested a different drive with an OS on the Z270-UD3 and it did not help, but I did not test that other drive with the Z370M DS3H

I have tested both ram sticks in multiple configurations of single and both, and both motherboards were tested both in a case and on a bench on top of the cardboard boxes they came in.

Is there anything that could be causing both these issues?

Other parts:
Viper DDR4 2x4GB 3200MHz CL 16 1.35V
Intel i7 - 7700K
Intel 256GB SSD

Edit: Immediately before the boot loop problem started happening with the Z270UD3 board, I came in the room to my left screen completely black and Premiere Pro Frozen on my right screen. My right screen is primary through HMDI, and the left is secondary through DVI. I held the power button until it turned off, and when I pressed it again it started the boot loop.

My problems with the Z370 DS3H I have only been using the on board HDMI, not the VGA and my graphics card has not been installed.
 
i believe your first board was fine and its possible your storage drive failed or the was some issue with OS, you could try to out it back together the 2nd board is out as poster above mentioned unless you wanna go 8th or 9th gen. create a usb win10 media installer and try to reinstall windows. either get a new storage drive or try on the old one. before you do when you put it back together with all storage drives disconnected can you boot to BIOS?
 
Nov 7, 2018
2
0
10

My bad about the Z370 board, I went off a single amazon answer saying it would support a 7th Gen Processor.

I put it back together on the first board without any of the drives. Same problem, a boot loop that never reaches BIOS.
This was with both RAM tested individually on DDIM 1 and 3.