X370 Killer SLI/ac won't POST

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   Clear CMOS on both mobos. Then start with 1 of them.

On first mobo, out of the case: hook up only CPU, cooler, 1 stick of RAM, GPU. Clear CMOS again. Double check PSU cables, esp. EPS12V & PCIe ones (for the GPU). Check jumpers and do a visual inspection. Mobo 1 should POST now.

If mobo 1 won't POST - swap CPU and RAM; clear CMOS again. Mobo 1 should POST now.

Repeat the above steps for mobo 2. Maybe it will be good if you keep a track of all this in a table. 

If mobo 1 & 2 still won't post with known good PSU & GPU, maybe the PSU or GPU are not that good after all?

P.S. try using HDMI cable for your monitor.

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zlobster Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 02 Sep 2017 Status: Offline Points: 403	Post Options Post Reply Quote zlobster Report Post Thanks(0) Quote Reply Posted: 14 Jan 2018 at 5:39am
	Clear CMOS on both mobos. Then start with 1 of them. On first mobo, out of the case: hook up only CPU, cooler, 1 stick of RAM, GPU. Clear CMOS again. Double check PSU cables, esp. EPS12V & PCIe ones (for the GPU). Check jumpers and do a visual inspection. Mobo 1 should POST now. If mobo 1 won't POST - swap CPU and RAM; clear CMOS again. Mobo 1 should POST now. Repeat the above steps for mobo 2. Maybe it will be good if you keep a track of all this in a table. If mobo 1 & 2 still won't post with known good PSU & GPU, maybe the PSU or GPU are not that good after all? P.S. try using HDMI cable for your monitor.
	1700X ZP-B1 (stock); X370 Taichi (UEFI 3.10); 16GB F4-3200C14-8GFX XMP; 256GB 960 EVO; RX 580 NITRO+ 8GB

Vandervecken Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 Jan 2018 Status: Offline Points: 16	Post Options Post Reply Quote Vandervecken Report Post Thanks(0) Quote Reply Posted: 14 Jan 2018 at 5:17am
	I'm a generally experiened PC builder but this is my first time with Ryzen. Components are: Board: x370 Killer SLI/ac Chip: Ryzen 7 1700 RAM: GSkill FlareX F4-3200C14D016GFX RAM v2: Patriot Viper Elite PVE44G240C6GY (2400MHz) PSU: Corsair HX750 (old part known good) GPU: NVidia Strix 1080 (old part known good) What happens: When I turn on the system the mainboard LED pulses red, and no video output. Things I have tried: Swapping between the two RAM sets (on the theory that I need a BIOS update to use the 3200 RAM) Going to a single DIMM in the A2 slot of the GSkill RAM Resetting CMOS Moving the GPU between the first and second PCI slots Switching to an ENTIRELY NEW x370 Killer SLI/ac board (I purchased two boards and two CPUs because I plan to do an identical build for my wife's PC, so I have a second board onhand) Inspected the CPU for bent pins when I moved it to the new board * Installing a PC Speaker by connecting it to the PC Speaker pins (no beeps resulted) Help please! Thanks, Michael