X470 Taichi not posting

Hi guys,

I am completely stumped and not sure if it's me that has caused an issue with the MB, or if there is another problem causing the issue/s.

I just got an X470 Taichi and I connected everything up outside of the Case on a little tech/test bench I have had for years. I went to power on the system and the CPU fan spun, but then I noticed I forgot to connect the 2 x 6-pin pcie connectors to the video card, and before I could turn it off by pressing the power button, the system/MB turned off itself, kinda like the power just cut out.

Could I have damaged something by doing this? From what I read on Google, I shouldn't have damaged anything, but the MB won't post at all now. The LEDs light up on the MB when the PSU is turned on, but the CPU fan doesn't spin and nothing else happens when pressing the power button - it doesn't seem to even attempt to post. The debug LED also don't light up at all when pressing the power button. It did the first time I tried booting up the system, but not sure what the numbers were as I was too busy looking at the GPU without the pcie connectors plugged in :(.

System specs are :

X470 Taichi
Ryzen 2700X
16GB (2x8GB sticks) G.Skill Ripjaws V 3200mhz CL16
GTX 460 (I use this for testing outside of the Case on a tech bench I have)
PSU Corsair HX 650 (I also use this PSU for testing)
1 x SATA HDD
1 x Liteon Optical Drive

I've taken out the CMOS battery and unplugged the power cord to the PSU and pressed the clear CMOS button, but that also doesn't seem to make a difference.

Also, I have tried a different video card that doesn't require any PCIe connectors and still nothing happens.

There is a couple of other things I am thinking could have caused an issue, but I'll wait to hear back from you guys first.

What else do you guys think I should try? Different PSU? I don't have another CPU to test as I only have this single 2xxx series CPU (could be an issue with the CPU?) and I was only putting it in to update the BIOS so that I could add support for a 3xxx series CPU.

not having the power to the video card shouldn't have caused any issues .. having components outside a case on a non-conductive surface shouldn't cause any issues either ..

.. only thing is maybe static charge from you if you weren't properly grounded or at least touched some metal prior to handling components.

You can try reconnecting power supply connectors to motherboard .. try just one stick of memory .. reseat video card .. pop battery out for 15 minutes (some have done it overnight) and pop back in and fire it up ..

Are you using a screwdriver or similar to jump the power pins or are you using a switch? .. if a switch , then unplug and try manually jumping the power pins.

Try a different PSU if you have one.

try using the lower pcie slot for a gpu

to rule out any issue with the top one

Yes, I definitely plugged in the 8 pin CPU cable. That was the first cable I plugged in and then I plugged in the 24 pin MB connector.

I tried a different PSU the other night and still no difference.

I'll try that GPU in a different slot. I never thought about moving the GPU to a different slot, but even if that slot is faulty, wouldn't the MB still power on but have no video output?

Xaltar wrote: Disconnect everything from the board, pull the CPU (and check for any damage/bent pins) and then reassemble with only the 8pin/24pin power, GPU (and it's power connectors) 1 stick of RAM, display cable and nothing else connected (no KB/mouse or other USB devices).

Hi, thanks for the reply.

Alright, I'll try that in the next day or two when I have some time. As for the CPU, what do I do if there is bent pins on the CPU? What should I use to try and straighten them with? Also, if there is bent pins, wouldn't the CPU not have gone into the socket properly or can it still go in with bent pins and not function properly? As for damaged pins, what would be the difference between a damaged and bent pin?

I'm new to AMD, have pretty much used Intel the past 15 years or so prior to this changeover to this system/platform.