X470 TaiChi not posting. Not sure what is causing the issue.

[IceZero09]

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 such as the CPU or MB itself, or another component that could be at fault.

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 was in a bit of a hurry and when I went to power on the system, 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 (I have a mini power button that I plug into the front panel pin header for when testing MBs outside the Case - I also tried a flat head screwdriver as I've used that in the past to power up a MB outside the Case). Anyway, before I could even reach for the power button, the system/MB turned off itself, kinda like the power just cut out.

Could I have damaged something by not plugging in the 2 x 6-pin PCIe cables to the graphics card? From what I read on Google searches I did shortly after, 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. I unplugged both the SATA HDD and also SATA Optical drive too and tried powering up without those.

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, and I was only putting it in to update the BIOS so that I could add support for a 3xxx series CPU. Could this be an issue with the CPU or MB?

 

[Caring1]

I'd check all cables first, make sure they are correctly located and latched in.
Then try another PSU if you have one.

 

[IceZero09]

I'd check all cables first, make sure they are correctly located and latched in.
Then try another PSU if you have one.

Alright, thanks. I have tried unplugging all cables, but that doesn't seem to have made any difference at all. If the PSU was dead or faulty, I'd assume the LED lighting on the MB wouldn't work or is that no indicator of the PSU possibly being faulty? I guess I will first try a different PSU like you've mentioned.

I am thinking it's either the MB or CPU, but PSU could also be a possibility.

So I assume I am right in thinking that me not plugging in the 2 x 6-pin PCIe connectors shouldn't have damaged anything?

Edit : typos.

 

[Toothless]

You didn't damage anything. I did the same thing earlier this year and it's still going.

 

[Assimilator]

So I assume you I am right in thinking that me not plugging in the 2 x 6-pin PCIe connectors shouldn't have damaged anything?

Yes. The system won't boot and the GPU might make a horrible noise to warn you that it's missing power, but nothing will break.

 

[IceZero09]

Thanks guys. I think you guys have jogged my memory a bit and I now vaguely recall powering up my old GTX 680 system years ago without the PCIe connectors in the video card and nothing happened back then. That system and those GTX 680s have run for years without any issue. It's still running right now.

I've pretty much tried everything else apart from PSU, CPU and MB. I will try out another PSU next, and also try and get another 1xxx or 2xxx series CPU if I can get one for a cheap price somewhere to test with.

Also, how do you test a PSU to make sure it's working. I thought I read years ago that you could put a wire between two pins and fire it up that way without it connected to a MB. I just want to see if the PSU works. I know you can get a PSU tester to test the voltage, but I just want to see if the PSU runs.

By the way, will the system normally power on if I tried a 3xxx series CPU in there if the BIOS isn't updated for Zen 2, or am I going to have to get a hold of Zen or Zen+ CPU to see if it's the CPU or Motherboard?

 

[$ReaPeR$]

Thanks guys. I think you guys have jogged my memory a bit and I now vaguely recall powering up my old GTX 680 system years ago without the PCIe connectors in the video card and nothing happened back then. That system and those GTX 680s have run for years without any issue. It's still running right now.

I've pretty much tried everything else apart from PSU, CPU and MB. I will try out another PSU next, and also try and get another 1xxx or 2xxx series CPU if I can get one for a cheap price somewhere to test with.

Also, how do you test a PSU to make sure it's working. I thought I read years ago that you could put a wire between two pins and fire it up that way without it connected to a MB. I just want to see if the PSU works. I know you can get a PSU tester to test the voltage, but I just want to see if the PSU runs.

By the way, will the system normally power on if I tried a 3xxx series CPU in there if the BIOS isn't updated for Zen 2, or am I going to have to get a hold of Zen or Zen+ CPU to see if it's the CPU or Motherboard?

Do you have any cooling fans connected?

 

[IceZero09]

Do you have any cooling fans connected?

Just one of the stock fans for the Noctua NH-U12A. That fan spun up the first time I tried booting the system for about 5-10 seconds before the power cut out and it all turned off.

 

[Assimilator]

Also, how do you test a PSU to make sure it's working. I thought I read years ago that you could put a wire between two pins and fire it up that way without it connected to a MB. I just want to see if the PSU works. I know you can get a PSU tester to test the voltage, but I just want to see if the PSU runs.

How to Power Up an ATX Power Supply Without a PC!

How to Power Up an ATX Power Supply Without a PC!: In this instructable i will show you how to power up an ATX Power Supply without a PC. Maybe in some cases you want to test an old CD-Rom Drive or something else. All that you have is a PSU from an old PC an a wire. Here I show you how do to it.

www.instructables.com

By the way, will the system normally power on if I tried a 3xxx series CPU in there if the BIOS isn't updated for Zen 2, or am I going to have to get a hold of Zen or Zen+ CPU to see if it's the CPU or Motherboard?

No way to be certain except with a 1xxx or 2xxx CPU.

 

[Bones]

CPU support should be fine, my X470 Tachi Ultimate fired up without a hitch with it's 2700x right out of the box and that was last year.
If you just got yours new the support should be there for it.

EDIT:
I did have to update the BIOS to support 3xxx chips but it worked fine after the update.
TBH yours should work without having to do anything to it with a 2xxx chip.

 

[IceZero09]

How to Power Up an ATX Power Supply Without a PC!

How to Power Up an ATX Power Supply Without a PC!: In this instructable i will show you how to power up an ATX Power Supply without a PC. Maybe in some cases you want to test an old CD-Rom Drive or something else. All that you have is a PSU from an old PC an a wire. Here I show you how do to it.

www.instructables.com

No way to be certain except with a 1xxx or 2xxx CPU.

Thanks. I think I will have to try and get a hold of a cheap 1xxx series CPU to test with.

By the way, when powering up a PSU without it being connected to the MB, do you have to have something else connected to it such as a fan or anything, or can you power it up with nothing connected just to see if it turns on? Looking at those pictures, I think I have one of those 24-pin ATX PSU jumper bridge connectors that I purchased years ago for a few dollars that I've never used.

CPU support should be fine, my X470 Tachi Ultimate fired up without a hitch with it's 2700x right out of the box and that was last year.
If you just got yours new the support should be there for it.

EDIT:
I did have to update the BIOS to support 3xxx chips but it worked fine after the update.
TBH yours should work without having to do anything to it with a 2xxx chip.

The MB isn't brand new, the BIOS only supports 1xxx and 2xxx series CPUs. I bought it from someone else and he said he never updated the BIOS as he had a 2xxx series CPU in it. I've had it for a while (4 or so months), but never got around to using it to build a system with until last night. Last night was the first time I powered it on. Anyway, with the CPU, I was basically wondering if the system would post with a 3xxx series CPU if you have a BIOS that doesn't support it.

Edit : Just to add to the thread - I also tried a different PSU a couple of hours ago, but same thing, no post and no debug LEDs turning on, on the MB giving any error codes. Only the MB LEDs come on when turning on the PSU, but nothing else seems to power up when using the power switch. It looks like it's either the CPU or MB.

If it is the CPU, do you RMA directly with AMD (I've never had to RMA a CPU before, ever, so not sure of the procedure). I also don't have the stock cooler, but do have the purchase receipt.