Question No post - Power supply shutting off

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SirtanksS

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Aug 3, 2019
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I recently bought all the components for a new PC, but after assembly, it would not post. When the PSU was turned on or plugged in, it would spin up the fans and lights initially, and after ~3 to 5 seconds, a click sound was heard from the PSU (indicating it shutting down? My current PC/PSU which I used to test has the same sound) and all fans and lights turn off, at which point the power button does not turn the PC on again.

I assumed it was some sort of bios issue and flashed the bios, at which point the computer stayed on for the duration of the update with the LED blinking as expected, but shut down immediately afterwards and would not turn on again.

This issue is still present after removing the GPU, testing with my previous (functioning) power supply and respective cables, clearing CMOS, and re-assembling the entire PC, as well as most of the steps on the "No post" thread, but I don't have a debug speaker/led to rule anything out.

I did take a gamble and buy it open box, but it’s still inside the return period, so I can get a replacement if needed.

Parts list:
CPU: AMD 7800X3D
Cooler: Noctua NH-L12S
Motherboard: Gigabyte B650I Aorus Ultra Mini
Memory: Corsair Vengeance 2x16GB DDR5-6000
Storage: 1TB SN850x nvme
GPU: Gigabyte 3070ti
PSU: Corsair SF850L
 
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Looks like that board had BIOS support for the X3D processors since the initial version so that shouldn't be the problem.

Did you connect both the 24 pin ATX connector AND the two 4 pin EPS/CPU connectors (Which look like a single 8 pin but will snap in half for using only a single 4 pin for older boards) at the top left corner of the motherboard?

If so, I'd recommend you pull the CPU and looks for bent pins on the motherboard. If there are none, I'd say a return was in order because usually these only get returned when they don't work out of the box or somebody screws one up, and then they just send them back out to the next person. Very likely it's the board though.
 
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Yes, both the 24 pin ATX connector and the 8 pin CPU connector were installed fully, I tried twice with the SF850L and once with my other PSU, using original cables from the respective PSUs. They made a click when inserted and didn't have any gap when plugged in.
 
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Everything else was brand new, not used or open box, right? If so, then it's pretty much gotta be the board. Have you TRIED it with no graphics card installed and monitor plugged into the motherboard video output just to be absolutely sure it's not a problem with the graphics card?

If so, and if you get this same behavior with no graphics card, no storage devices and no other connected hardware such as USB mouse or keyboard, and ONLY the CPU and memory installed, then it pretty much has to be the board or the CPU, and since it was open box, makes the board very likely.
 
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Zerk2012 said:
Is the power supply just turning off or do you have to flip the switch on the PSU to try it again?
Click to expand...
After it makes the click sound, I have to flip the switch on the PSU to turn it back on, however this doesn't always work and I'll have to unplug it from the wall as well. The power button on the case does not turn it on in any scenario, only the PSU switch.
 
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Darkbreeze said:
Everything else was brand new, not used or open box, right? If so, then it's pretty much gotta be the board. Have you TRIED it with no graphics card installed and monitor plugged into the motherboard video output just to be absolutely sure it's not a problem with the graphics card?

If so, and if you get this same behavior with no graphics card, no storage devices and no other connected hardware such as USB mouse or keyboard, and ONLY the CPU and memory installed, then it pretty much has to be the board or the CPU, and since it was open box, makes the board very likely.
Click to expand...
Everything is new, except for the motherboard, and my GPU, which is currently back in my old build and functioning perfectly fine. I did try with no GPU installed and the HDMI+DP cable plugged into the motherboard, and it resulted in the same sequence of power on -> fans spin -> PSU shuts off after ~3-5 seconds.
 
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Darkbreeze said:
Have you tried with NO front case panel cables connected to the motherboard? As seen at the following link? It's always possible you've connected something wrong, and while it's not likely in this case, anything is possible including there being some problem with the front I/O mini board or wiring that is no fault of yours.

View: https://www.youtube.com/watch?v=FuPZlliGqBw
Click to expand...
I'll give it a shot, there's an odd adapter for the front panel connections which might be causing it.
 
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rolli59 said:
Sounds like protection kicking off. Could be short circuit if standoffs not properly configured.
Click to expand...


Right. Could certainly be something like a standoff in the wrong place under the board. But could just as easily be a problem with the board itself OR an improper front panel connection triggering protections.


How To - Motherboard bench testing

Finding the problem through bench testing If you are here then it’s likely you have encountered a serious hardware issue and have been unable to resolve it using the standard no-POST troubleshooting procedures. If you have not yet attempted to resolve your issues using the no-POST...
forums.tomshardware.com forums.tomshardware.com
 
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Darkbreeze said:
Have you tried with NO front case panel cables connected to the motherboard? As seen at the following link? It's always possible you've connected something wrong, and while it's not likely in this case, anything is possible including there being some problem with the front I/O mini board or wiring that is no fault of yours.

View: https://www.youtube.com/watch?v=FuPZlliGqBw
Click to expand...
Jumping the connection with a screwdriver worked! It booted into Bios as expected, I'll give it some more testing to try and figure out exactly what it is. The case is a Fractal Ridge, forgot to mention that earlier. All 4 standoffs were pre-installed.
 
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Pre-installed is OFTEN the problem if the case is one that supports multiple form factors and your board is a form factor different than the specific one they were preinstalled for OR if they included standoffs preinstalled in ALL of the possible configurations. Usually you will then need to remove some and make sure ONLY the ones that match the exact locations of your standoff holes in your motherboard are installed and set the others aside somewhere. Have to also be careful in cases where there are integrated standoffs because sometimes certain boards can't be used with them, just as an FYI for future reference. Obviously not the problem in your case and likely is due to something about the proprietary front panel connector. I would recommend you NOT use an "all in one" type connectors from the front of the case if possible and instead connect each individual connector where it goes on the board based on the motherboard manual.
 
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Darkbreeze said:
Pre-installed is OFTEN the problem if the case is one that supports multiple form factors and your board is a form factor different than the specific one they were preinstalled for OR if they included standoffs preinstalled in ALL of the possible configurations. Usually you will then need to remove some and make sure ONLY the ones that match the exact locations of your standoff holes in your motherboard are installed and set the others aside somewhere. Have to also be careful in cases where there are integrated standoffs because sometimes certain boards can't be used with them, just as an FYI for future reference. Obviously not the problem in your case and likely is due to something about the proprietary front panel connector. I would recommend you NOT use an "all in one" type connectors from the front of the case if possible and instead connect each individual connector where it goes on the board based on the motherboard manual.
Click to expand...
Yep, I'd normally double check but the case only has 4 standoff points that match with the 4 on the motherboard, so there's definitely nothing stuck behind it causing a short. Thanks for letting me know though.

The adapter I mentioned is part of the motherboard, not the case though. There's the "Front card" that plugs into the motherboard to the right of the ram, with 4x sata ports, sys_fan, a led connector, and a 2x5 pin connector for the front panel adapter, which has all the standard connections. The motherboard manual indicates to plug front panel connections into the adapter, which is what I did. Not sure where I'd be able to plug it directly into the board without the adapter, but I'll see if there's anything online.
image.png
 
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Something on your front panel connections might be slightly different than the adapter for the board. I never use any adapters or all in one plugs unless it's on an OEM type case and board where they were BOTH fully meant to be used together and you have no choice.

In your case it looks like you don't have a choice since it uses a card to connect to the FP connector on the back of the motherboard and then I assume you connect your front panel cables to the other end of the adapter. So either there is a problem with the card, or the adapter or you plugged something in wrong to the other end of the adapter unless there is something wrong with front I/O electronics on the case itself.
 
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Darkbreeze said:
Something on your front panel connections might be slightly different than the adapter for the board. I never use any adapters or all in one plugs unless it's on an OEM type case and board where they were BOTH fully meant to be used together and you have no choice.

In your case it looks like you don't have a choice since it uses a card to connect to the FP connector on the back of the motherboard and then I assume you connect your front panel cables to the other end of the adapter. So either there is a problem with the card, or the adapter or you plugged something in wrong to the other end of the adapter unless there is something wrong with front I/O electronics on the case itself.
Click to expand...
After more testing it's certainly the power button connection. Every step of assembly before it, including all other front IO connections have no issues getting to bios, but once I connect the power button header (either orientation), it repeats the original issue.

Think there's any way to bypass this without connecting it for regular use, or would it best to contact Gigabyte/Fractal support and ask there for workarounds?
 
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If you just bought the case I'd return it for replacement. Contact Fractal and explain it to them. See if they want you to return it or if they want to deal with you directly. I can tell you from personal experience that Fractal Design is VERY, VERY good about customer service.

I received a case from Amazon that clearly had been returned because there were no feet in the box for the case. I contacted FD and they drop shipped me a set of replacement feet immediately, with no charge at all.

Then later on, for the same case, I purchased a tempered glass side panel for my Define S2 from several retailers including Amazon, Newegg and some other seller out of Florida. ALL three side panels arrived shattered in the box because none of them shipped it with any additional packing material or box, just the actual box the side panel gets put into when it comes off the assembly line. Had to fight with all of them to get a refund. I contacted Fractal Design and explained the situation to them and told them I was happy to pay them directly for a side panel and even pay extra for additional measures to ensure the panel would not get broken during shipping. Instead, they DID pack it in additional material, extremely well, with two layers of "peanuts" between two boxes, AND they did not charge me for either the side panel or the shipping because of the hassle I had already gone through.

I think if you contact them they will take care of you.

Or, you can always just try replacing the power switch yourself with one off Amazon or wherever.
 
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