Question CPU fans spin for a bit when I flip the PSU switch, RAM lights up, but fans stop spinning and PC doesn't POST ?

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Recks214

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Aug 11, 2014
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Good day, running into a very strange issue, wondering if anyone has come across this issue.

So last night I was able to use my PC just fine, I turn it off and go to bed, and as usual once everything's off - I switch off my UPS.

The next day I switch on my UPS, I notice my PSU makes a clicking noise. I haven't even pressed the power button, the RAM sticks light up, and the fans spin for a second the moment the PSU gets power. The PC doesn't POST though, and no display on either monitor

I noticed:
Holding down the power button doesn't do anything, RAM RGB stays on, fans don't spin at all still.
PSU makes a click consistently when flipping the switch off, then on

I've tried:
Reseating RAM
trying to POST without GPU (Or at least, get normal booting behavior)
Removing PSU cable to CPU and trying to POST
Plugging to wall directly (not using UPS)

And no dice.

I pulled out the PSU and used the "PSU Tester" that comes with the Seasonic box, and the PSU fans spin when I connect the tester/jumper.

I'm at my wits end here - just got back from a month and a half long vacation and I'm itching to get some gaming done.

Specs:
Seasonic GX 750 (Recently replaced a faulty ASUS TUF Bronze 750w)
3060ti
32gb ddr4 3200mhz RAM
i7 12700f
1 sata ssd, 1 m.2 ssd, and 1 sata hdd
 
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COLGeek said:
When you replaced the PSU, did you remove all power cables from the first PSU with it? PSU cables are not interchangeable.
Click to expand...
Yeah, my old PSU was non-modular, this one is. I also made sure that I'm not using the CPU cable for PCIe and vice versa. It was working for a good few months until this morning.
 
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Update:

I removed the CMOS battery and put it back on, and the weird behavior has stopped, I managed to get to the windows login screen before my computer restarted itself twice, once with display - restarting then with no display. I noticed that my 3060ti was no longer lighting up, but RAM RGB was lit up.

I changed it with my spare RX570, same behavior, no display but the GPU lights up this time. I'm thinking it could now either be:
-PSU Cable
-PSU itself
-GPU slot on motherboard/Motherboard
 
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COLGeek said:
I am leaning toward the PSU as the problem.

When you power your system down, are you powering down the UPS and flipping the PSU toggle switch to off? If so, why?
Click to expand...
I power down the UPS since I use it as an AVR w/ Battery. I don't toggle the PSU switch off.

Though, I managed to boot into windows and use my PC now, for whatever reason a power cycle did the trick, something along the lines of XMP causing issues and my CMOS battery probably dying (I noticed the time was wrong when I booted into windows)
 
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When you removed the battery, you reset the BIOS, including its stored time.

If your system won't retain the time, change the motherboard battery itself.

Powering down the UPS is not necessary for most users. Mine run 24/7/365 with zero issues whatsoever.
 
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COLGeek said:
When you removed the battery, you reset the BIOS, including its stored time.

If your system won't retain the time, change the motherboard battery itself.

Powering down the UPS is not necessary for most users. Mine run 24/7/365 with zero issues whatsoever.
Click to expand...
Oh, that explains the time thing then - what I have no idea is why a power cycle fixed the issue when it worked fine last night - I'll have to observe further. Thanks for your assistance.
 
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Motherboard batteries tend to last a very long time.
Their purpose is to preserve settings, particularly ram settings across a full power off without the pc plugged into the wall. Plugged in, even with the psu switch off, there is always a trickle of power.
I suspect your practice has made the motherboard battery deteriorate faster than normal.


Consider not powering off at all.
Use sleep to ram (no hibernate) instead.
That puts the pc and monitor into a very low power state close to a full power off.
sleep/wake become a handful of seconds.
Looking at task manager, I see that I have been up for 12 days without issue.
 
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Recks214 said:
I notice my PSU makes a clicking noise.
Click to expand...
Your PSU is almost certainly dead. No working PSU should EVER make "clicking" noises.

The more that you try and use it the more chance there is that the PSU will fry something else in your system.!

Try a different PSU that is known to work and is of a decent quality and sufficient power output for your system and try it again. Either borrow it from a friend, or take your PC to a friends house and try it there, take it to a computer repair shop, or simply buy a new PSU. Also check the warranty, Seasonic warranties are often very long.
 
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Recks214 said:
I pulled out the PSU and used the "PSU Tester" that comes with the Seasonic box, and the PSU fans spin when I connect the tester/jumper.
Click to expand...
That isn't a PSU "tester", they are not shipped with a PSU as they cost real cash (20 $/£/Euro minimum), what is most likely supplied is essentially a wire that turns on the PSU when plugged into the mains, I used to do this regularly using a paperclip as the most basic test of a PSU, it's pretty meaningless and nothing close to an actual PSU tester and FYI actual PSU testers are not 100% guaranteed to identify all PSU faults that exist.
 
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The plug that Seasonic supplies is essentially a "paper clip" tester.
If the test fails, the psu is most assuredly dead or one has bungled the test.
But, it says nothing about the proper functioning of the psu.
Considering that the GX-750 is a top quality psu that was working before, and is working now, I would look elsewhere to explain strange behaviors.
 
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