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53 posts

Master Geek


#270116 24-Apr-2020 12:13
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Hi all, so as the title says essentially every time I shut down my pc it will not power back on immediately unless I remove the cmos battery or I unplug the psu from the mains for 15 minutes than it will power on and away it goes until I shut it down again, thus the cycle continues.

A bit of history it all started from the pc going into “sleep” from which I could not wake it with keyboard or mouse so a manual shutdown was required to get it to start again. Since than I adjusted the power settings so it would not sleep but stay on until I shut it down, a temporary workaround that was fine for a while but now it refuses to boot immediately after shutdown.

Things I’ve tried
Flashing the latest bios.
Resetting bios settings to factory
Booting with one ram stick/reseating ram sticks
Running Memtest to eliminate RAM
Removing any USB devices other than KBM than trying to power on.
Tried in another case as I thought front I/O may be faulty.. nope

Things I will try next
New cmos battery
Installing any OS updates (I turned auto updates off)
New surge protector, maybe current one is faulty and dirty power through mains causing issues?

Things I can’t try
Another motherboard
Another CPU
Another PSU
Booting without gpu as 2600x has no integrated graphics

I’m totally stumped, and Dr Google throws out all sorts of scenarios which look leads you down 5 different rabbit holes.

Specs as follow
Ryzen 5 2600x
Gigabyte b450m
16gb ram
550w psu
RX5700

Any suggestions? Thanks

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1676 posts

Uber Geek

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  #2469165 24-Apr-2020 12:30
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I had a brand new pc build fail in a similar way after 1 year. . %100 sure it will be the powersupply

 

https://www.jam-software.com/heavyload

 

run that to test it , expect your pc to shut down within 1 or 2 minutes of starting it

 

Rather than pull the cmos battery every time , you can do a power drain by pulling the power lead out and holding the front case button on for 30 seconds.

 

also use cpuid hwmonitor to view the voltages and temps etc.

 

https://www.cpuid.com/softwares/hwmonitor.html

 

 




53 posts

Master Geek


  #2469172 24-Apr-2020 12:37
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Cheers I’ll give it a go. My first thought was the PSU and still think it may be the issue.

 
 
 
 


1676 posts

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  #2470772 25-Apr-2020 10:03
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Is there an update?

 

 




53 posts

Master Geek


  #2471239 25-Apr-2020 18:08
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Apsattv:

Is there an update?


 



I ran the stress test and nothing out of the ordinary popped up, temps were fine along with voltages.

All windows updates installed and switched out surge protector and issue still persists. At this point I have no clue and without spare parts I can’t test any further.

1055 posts

Uber Geek

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  #2471243 25-Apr-2020 18:24
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Other things to try...

 

Running Windows in Safe Mode.

 

Running PC Startup diags...

 

Boot PC from a Linux USB Stick... Set Bios to start with USB... and see if you have shut down/ Startup problems.

 

 





Gordy


389 posts

Ultimate Geek


  #2471246 25-Apr-2020 18:28
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try turning off fast boot - have seen problems booting with it on

 

https://www.howtogeek.com/243901/the-pros-and-cons-of-windows-10s-fast-startup-mode/




53 posts

Master Geek


  #2471263 25-Apr-2020 19:36
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Will give these suggestions a go and report back.

 
 
 
 


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  #2471575 26-Apr-2020 13:25
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You could try this

 

https://www.ultimatebootcd.com/

 

it has a number of boot up stability tests, i used it to confirm my power supply issue. Using the cpustresstests

 

 

 

Just to confirm you shut the pc down completely? then pressing power button the pc won't come back on?

 

Do the lights come on? does the power supply fan and cpu fan come on?

 

Can you boot into the bios?

 

 

 

 

 

 


2155 posts

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Trusted

  #2471597 26-Apr-2020 14:06
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When it boots, check it’s not failing over to the 2nd bios.



53 posts

Master Geek


  #2471618 26-Apr-2020 14:49
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Apsattv:

You could try this


https://www.ultimatebootcd.com/


it has a number of boot up stability tests, i used it to confirm my power supply issue. Using the cpustresstests


 


Just to confirm you shut the pc down completely? then pressing power button the pc won't come back on?


Do the lights come on? does the power supply fan and cpu fan come on?


Can you boot into the bios?


 


 


 



Correct, complete shutdown and than pushing the power button does nothing, no lights or fans spin. In order to boot I have to switch off the PSU for about 15min before it will post and boot again.

1055 posts

Uber Geek

Lifetime subscriber

  #2471630 26-Apr-2020 15:17
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That is a pretty low level hardware fault and sounds like the power supply is not sensing the power switch.

 

If you remove the 20 or 24 pin power connector from the mother board and jumper the green wire pin to a black wire pin...

 

Does the power supply and fan start up?

 

 

 

 

 

 

 

 

 





Gordy




53 posts

Master Geek


  #2471636 26-Apr-2020 15:49
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Yes fans spun up as normal.

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  #2471637 26-Apr-2020 15:52
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I have had crazy non powerup things with a USB device backfeeding into the motherboard. Does unplugging USB stuff make it come back?





Richard rich.ms



53 posts

Master Geek


  #2471640 26-Apr-2020 15:56
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At first I thought that may be the cause too as I actually got a post when I unplugged all non essential USB devices, but all I have plugged in is Keyboard, mouse and Bluetooth dongle for wireless headphones and problem still persists.

1055 posts

Uber Geek

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  #2471648 26-Apr-2020 16:13
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So the problem seems to be somewhere on the MB between the front panel switch connection and the PSU startup pins.

 

You have upgraded the BIOS and restored to factory defaults....

 

Does the MB look clean and tidy. No sign of swollen capacitors or MB corrosion?

 

How old is the MB? There is some mention on the web of faulty capacitors causing startup problems.

 

Has the MB ever been subject to dampness or water?

 

Any diags in the BIOS to test power startup?

 

Does the PC restart ok.





Gordy


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