X570 Tomahawk "cold" start failure with cpu debug light on.

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Apr 14, 2021
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Hi, frustrating problem with X570 Ryzen 3600 setup, when I try to boot from overnight shutdown the cpu debug comes on and all the fans spin up (chipset fan flat out) ram rgb lights up but no beep and no boot. Have cleared cmos multiple times and updated bios, eventually after many attempts I get a boot, I set bios to default and off we go, I use it all day and shut it down for short time for meals etc and it starts ok, but after an overnight shutdown the saga starts all over again
 

citay

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Can you list all your components? Especially curious about the PSU. Maybe it could have something to do with that.
 
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Thanks for reply, system details :- Ryzen 5 3600/ MSI MAG X570 Tomahawk wifi/ Adata Spectrix D60 G 3600 MHz 2x 8GB/GTX 1050 ti/ WD Black SN850 500GB/AIO twin fan cooler/ NZXT Hale90-750-M 750W. Did think about power supply but all fans spin up including graphics card (don't normally spin unless stressed) and chipset fan running flat out, the cpu debug led lights up as soon as i push start button and stays on all the time, also the led lights in the on/off switch don't always come on. Have contacted motherboard suppliers support (only had it 5 weeks) and they say it's a new one for them but are prepared to do a return and test.
 

citay

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Power supply fully tested and correct voltages showing on all outlets. ???????????????
I still think it could be the PSU. I was gonna write yesterday that many people re-use their old PSU, and it can't cope with the new system anymore. But i wanted to see what PSU you had first. Sure enough, it's a 10 year old PSU. Now, it was decent back then, but components in there age (namely the capacitors). NZXT gave 5 years warranty, meaning that was the timeframe they deemed comfortable for the capacitors they used. Anything above that is a bonus. After 10 years, no matter how good your PSU was, it's time for a replacement.

You cannot test a PSU by just looking at the voltages with no load applied. Every PSU can provide stable voltages with no or little load. Once you apply load, the voltages can drop, and with old capacitors, the ripple on the output voltages cannot be kept in check properly anymore. These things you don't even see by looking at the voltages, you need an oscilloscope to visualize that.

I would heavily advise to test with a new PSU, my favorite brands are "be quiet!" and Seasonic, 80 PLUS Gold or better. You might see that the problem will disappear then. And if not, at least it was much easier to try than RMAing the mainboard, plus it's about time you got a new PSU.
 

Baskura

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Apr 13, 2021
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I had this issue with a Corsair HX1200i (which was recalled for the issue) upon where it wouldn't boot from cold, it needed to be warmed up first - it was a manufacturing error within a certain batch. I would also be checking the PSU first, so let us know.
 
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PSU arrived, carefully installed it for a test and the same symptoms.......cpu led solid, all fans flat out and no beeps or boot, tried restarting 4 times, nothing, stripped cpu, ram and graphics card from motherboard and flashed bios with latest beta version (7c84v163 ) and cleared cmos by removing battery and capping motherboard pins, reseated everything and tried again, same problem but at the 4th restart attempt the cpu led went out and the chipset fan stopped whirring and praise the lord I was in the bios. Have enabled XMP in bios and have been using it for 3 hours, done a benchmark and stress test and all seems well, but will it fire up in the morning ?.....................watch this space.
 
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After multiple attempts with cpu led on solid each time it is working as normal, there is still an underlying problem somewhere.
 

citay

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I am starting to think power switch on case maybe faulty, am testing setup with an old case.
If you suspect that, you can also switch the RESET and the POWER button, and turn it on with the reset button for testing.
 
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After testing in old case for 2 days without any problems decided to remove switch with 3 led's from original Phanteks case and inspect, dark stain across printed circuit on rear, cleaned with contact cleaner and tried in old case before rebuilding complete setup (including original NZXT psu) into Phantek case, system now booting and working smoothly (average boot time 30 seconds)P.S. sent email to Phantek but they did not reply. Hope this helps someone else with strange boot problems.
 
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May 14, 2021
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I don't want to hijack your thread, but I'm running into this very same problem with my system after swapping out the stock cooler for a Cooler Master Hyper 212 BE.
I've got very similar specs : Tomahawk wifi, 3700x, 1070ti, 2x16gb GSkill ripjaw @3600mhz, 1tb nvme ssd, 240gb nvme ssd, 4tb HDD, Corsair RM1000 PSU in a random Rosewill case.
PSU is old but it's never been an issue, even with much more power-hungry builds and I checked the power button and it's connections and found no obvious issues.
No matter what I change or move around it powers up and all fans spin at high rpm and the CPU debug light stays on. I got it to boot for 3-5 minutes once but then it black-screened and the CPU debug light was on again
 
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Nevermind, I'm an idiot. I must have pulled on either the 24 pin cable or the 8 pin CPU cable when reinstalling my rear side panel of my case. A quick clean and reseat of all PSU cable and she's good to go
 
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