ASRock Forums : Z97 Extreme4 not powering on after unplugged https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Thu, 09 Apr 2026 17:12:24 +0000 Sat, 03 Feb 2018 01:44:50 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=3503 <![CDATA[ASRock Forums]]> https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ <![CDATA[Z97 Extreme4 not powering on after unplugged : Thanks for this post. I am having...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=44468&title=z97-extreme4-not-powering-on-after-unplugged#44468 Author: WarriorDog
Subject: 3503
Posted: 03 Feb 2018 at 1:44am

Thanks for this post.  I am having a similar issue.  No matter what I did I could get absolutely nothing after turning power on.  I tested the psu on another computer and found nothing wrong with it.  I shorted PS_ON as you suggested and components came on.  I was afraid my mobo was dead so I tried plugging the main power connector back into the motherboard with the PS_ON jumped to COM with a single strand of copper wire.  Turned the psu on and everything comes to life and mobo lights come on like normal.  After that the power button works to turn it on and off.  There must be something wrong with the motherboard to the PS_ON pin.]]> Sat, 03 Feb 2018 01:44:50 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=44468&title=z97-extreme4-not-powering-on-after-unplugged#44468 <![CDATA[Z97 Extreme4 not powering on after unplugged : Two words, Inrush CurrentTwo more...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=20121&title=z97-extreme4-not-powering-on-after-unplugged#20121 Author: wardog
Subject: 3503
Posted: 05 Dec 2016 at 9:42am

Two words, Inrush Current

Two more words: Not Good

http://sound.whsites.net/articles/inrush.htm


Why people continue to cycle power is beyond me. That whole reddit thread can be summed up to continuously and needlessly exposing your motherboard and PSU to inrush current.



]]> Mon, 05 Dec 2016 09:42:16 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=20121&title=z97-extreme4-not-powering-on-after-unplugged#20121 <![CDATA[Z97 Extreme4 not powering on after unplugged : Hi, I have the exact same symptoms.It...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=20106&title=z97-extreme4-not-powering-on-after-unplugged#20106 Author: Syn
Subject: 3503
Posted: 05 Dec 2016 at 2:28am

Hi, I have the exact same symptoms.
It seems to be a known issue with this mobo.
https://www.reddit.com/r/buildapc/comments/2jrt1b/psarequest_possible_reoccurring_problem_with_the/

I'm now at the point where I can't start the PC anymore. No matter how often I unplug and retry.
Don't know what to do anymore.

]]> Mon, 05 Dec 2016 02:28:59 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=20106&title=z97-extreme4-not-powering-on-after-unplugged#20106 <![CDATA[Z97 Extreme4 not powering on after unplugged : Hi !I checked the Voltage between...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17777&title=z97-extreme4-not-powering-on-after-unplugged#17777 Author: Owca
Subject: 3503
Posted: 16 Oct 2016 at 8:38pm

Hi !

I checked the Voltage between pin 9 and COM today, after 14 h of PC being unplugged.
It went from 0 to 5,1 V in about 2-3 sec.

Also i need to add that the weird noise from speakers appearred at the same time as problem with PC not starts showed up - i doubt this is a coincidence, as this lead me to thinking that my MB is failing.

Anyway, from what you said before - this test proves nothing, because there were no load.
Now i wonder - what can i do next ?



]]> Sun, 16 Oct 2016 20:38:26 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17777&title=z97-extreme4-not-powering-on-after-unplugged#17777 <![CDATA[Z97 Extreme4 not powering on after unplugged : The spurious sound through your...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17728&title=z97-extreme4-not-powering-on-after-unplugged#17728 Author: parsec
Subject: 3503
Posted: 15 Oct 2016 at 11:49am

The spurious sound through your speakers is random and is useless in diagnosing the problem.

Recording the length of time before the PC can start in the morning is also useless in diagnosing the problem.

The general trend of the delay time seems to be getting longer, as the +5VSB power rail continues to deteriorate. Soon your PC will fail to start, or take 10+ minutes to warm up that rail.

Why you continue to turn off power to the PC at night, I simply cannot understand.
]]> Sat, 15 Oct 2016 11:49:50 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17728&title=z97-extreme4-not-powering-on-after-unplugged#17728 <![CDATA[Z97 Extreme4 not powering on after unplugged : First of all, hello and thank...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17721&title=z97-extreme4-not-powering-on-after-unplugged#17721 Author: Owca
Subject: 3503
Posted: 15 Oct 2016 at 2:54am

First of all, hello and thank you very much for your response.
I will check the Voltage on Sunday in the morning.

Originally posted by parsec parsec wrote:


Question: If you do NOT remove AC power from the PSU overnight, does the PC start fine immediately in the morning with no waiting? My guess is that it would start fine.


Answer 1: I will check that tommorow morning.
15.10.2016 - Correct, PC turns on immediately.

Originally posted by parsec parsec wrote:


Question: Why did you think the board was the problem, when the component that is first in line to be affected by your habit of removing AC power from the PC, is the PSU?


Answer 2: Because i can hear a weird diminishing in frequenzy sound from my speakers (connected to MOBA) so i thought tha the power somehow comes through the motherboard to speakers doing some havoc on the way.

I recorded this sound today for a few seconds:

http://www.filedropper.com/pc-sound1

Also i started to writing down the time that i need to wait before PC powers up.
For the first 2 minutes i press power button every 30 seconds, afterwards in 10 seconds interval.
I do it once a day, in the evening when i turn on my PC.
Here are some results:

2.30
2.20
2.40
3.30
4.10
4.30
4.20
1.30 (not a typo)
4.30
4.50
4.40



Edited by Owca - 15 Oct 2016 at 6:58pm]]> Sat, 15 Oct 2016 02:54:44 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17721&title=z97-extreme4-not-powering-on-after-unplugged#17721 <![CDATA[Z97 Extreme4 not powering on after unplugged : Owca wrote:Hello all !I have...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17691&title=z97-extreme4-not-powering-on-after-unplugged#17691 Author: parsec
Subject: 3503
Posted: 13 Oct 2016 at 12:37pm

Originally posted by Owca Owca wrote:

Hello all !

I have very curious problem with my MOBa.

When I unplugg my PC from electrical outlet (i switch off strip surge) and came back after a day (i use PC during evenings, every day) I plug it back (switch on strip surge) but the system does not respond to power and I cannot start PC (no lights, no fans). 
Oddly enough, after a 2-3 min of doing nothing the system comes back to normal state and i can start PC by pressing power button.
I have to add that after I plug power on, I can hear weird sound (beep, beep) in my speakers with decreasing frequency - it last around 20 sec and then slowly fades to consant low noise, typical when i speakers are plugged in, but there is no input.

Please advise - i am afraid that soon my PC will no longer be able to start at all !

MOBa details:
Z97 Extreme4/A/ASRK
Serial No. is 48M0XD055904


Originally posted by Owca Owca wrote:

Hey, can anyone help me out here ?
Is there a way to check PSU with only electric measurement tool (multimeter) ?


To review your situation:

If you remove AC power from your (unknown, mystery) PSU (PC power supply) via a surge strip, when you apply power to the PSU again, it takes several minutes before you are able to start the PC with its own power switch, correct?

After the PC does start, it runs normally and does not seem to have any problems, correct?

Question: If you do NOT remove AC power from the PSU overnight, does the PC start fine immediately in the morning with no waiting? My guess is that it would start fine.

Given this, my guess is the +5VSB (+5 Volt Stand By) rail in your PSU is starting to fail. When AC power is applied after being off over night, it takes several minutes for it to reach a stable +5V DC. That seems like a bad capacitor in that circuit, but who knows?

When a PSU is connected to AC power, and the PSU power switch is on, the +5VSB rail in the PSU will be on/active, and supply that voltage to the board. As well as allowing the electrical switch on the PC case to activate the rest of the PSU power circuitry, and cause the PC to start, it also keeps a few other parts of the mother board active, like the networking chip.

The power switch on a PC case is not a mechanical switch like a light switch. It is just a momentary contact switch that serves as a signal to the mother board and PSU, to activate the main voltage rails in a PSU. That is why we can "turn off" our PC with the Windows Shutdown command, which causes the mother board to send the signal to the PSU to deactivate the main voltage rails.

Testing PC PSU voltages can reveal nothing, because they are usually done with no load on the PSU. It works fine supplying zero Amps into a volt meter, but put a load on it and it is out of spec or fails.

This is the 24 pin ATX connector pin output, plus the others:



Pin 9 is the +5VSB rail pin on a 24 or 20 pin ATX connector.

It might be easy to verify the +5VSB rail is failing in your PSU, given the symptoms. You must only check the pin 9, +5VSB pin. The other +5V pins are provided by the main +5V rail.

Do not connect AC power to the PSU. You should have the PSU disconnected from AC power for several hours or over night, to match your failure situation. Connect the +/red voltmeter cable to the +5VSB pin (pin 9) and the black/ground cable to any COM (Ground) pin. Set the voltmeter to an appropriate DC voltage range, and apply AC power.

You are interested in the voltage in the first minute or two immediately after AC power is applied. If you do not get close to 5.0V immediately, or within a few seconds, the +5VSB rail is not working correctly. But you are testing with no load on the rail, so if you get 5V immediately, that rail could still be bad. The voltage tolerance on that rail is +/- 10%. The maximum current supplied by the +5VSB rail is 3A, in even the most expensive PSUs. Some PSUs only provide 2.5A, and hopefully not less.

You could check the other PSU rails, but I doubt they are the problem. For this testing, connect the voltmeter to the voltage rail (12, 5, or 3.3V) you wish to test, with the ground to any COM pin. Apply AC power to the PSU, you will get nothing yet on the voltmeter.

Using something like a paper clip bent into a U shape, short the PS_ON# (pin 16 on a 24 pin connector) to a COM/ground pin. That will cause all the main PSU rails to become active.

Question: Why did you think the board was the problem, when the component that is first in line to be affected by your habit of removing AC power from the PC, is the PSU?

]]> Thu, 13 Oct 2016 12:37:46 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17691&title=z97-extreme4-not-powering-on-after-unplugged#17691 <![CDATA[Z97 Extreme4 not powering on after unplugged : Hey, can anyone help me out here...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17680&title=z97-extreme4-not-powering-on-after-unplugged#17680 Author: Owca
Subject: 3503
Posted: 13 Oct 2016 at 2:14am

Hey, can anyone help me out here ?
Is there a way to check PSU with only electric measurement tool (multimeter) ?
]]> Thu, 13 Oct 2016 02:14:39 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17680&title=z97-extreme4-not-powering-on-after-unplugged#17680 <![CDATA[Z97 Extreme4 not powering on after unplugged : OK, i have asked around and unfortunately...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17620&title=z97-extreme4-not-powering-on-after-unplugged#17620 Author: Owca
Subject: 3503
Posted: 09 Oct 2016 at 11:38pm

OK, i have asked around and unfortunately i cannot get any other PSU than new one from the store.
However i have a multimeter i can check the voltages on PSU, but i dont know where should i measure it on ATX power plug (24 pin), anyone can guide me to do it ?
Will that be a valid check for PSU ?
]]> Sun, 09 Oct 2016 23:38:26 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17620&title=z97-extreme4-not-powering-on-after-unplugged#17620 <![CDATA[Z97 Extreme4 not powering on after unplugged : Do you or a friend have another...]]> https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17267&title=z97-extreme4-not-powering-on-after-unplugged#17267 Author: wardog
Subject: 3503
Posted: 29 Sep 2016 at 6:01am

Do you or a friend have another capable PSU to test with.

Honestly, how you switch power on and off like you do is down right gruelling to any PSU. And it should be added, motherboard too.

But I'd first swap in a capable PSU to test and see if this issue goes away.
]]> Thu, 29 Sep 2016 06:01:24 +0000 https://forum.asrock.com/forum_posts.asp?TID=3503&PID=17267&title=z97-extreme4-not-powering-on-after-unplugged#17267