PSU does not shut off after Win7 shutdown.

[MNA24]

Hi All,

I have recently upgraded my system cooling to watercooling and everything is working great. My only issue is sometimes after my PC has been on for say 5+ hours with an hour or 2 of gaming and some general web browsing youtube/facebook etc, when i come to shutdown my pc everything closes down correctly and shuts down but my pc still keeps all the fans/waterpump and lighting on. Only way to stop this is to either hold in the power button several seconds or to flick the switch on my PSU. On startup after this has occured, windows boots perfectly without any errors.

PC SPECS ARE IN MY SIG (The system is currently running stock, no overclocking)

This only ever occurs when my pc has been on for a long time. I have performed the following as a means of trying to trouble shoot the problem:

• Re-Flashed the Bios to latest version (1301) and set optimized defaults (No Overclocking)
  
• Booted system with only mouse and keyboard to see if any other devices were causing issues (USB Creative Soundcard, front panel ports, webcam)
  
• Re-installed windows
  
• Swapping the RAM around.
  
• Any form of sleep or hibanate within windows has been disabled.
  

It's something that is hard to test if its still occuring at it only happens after the system has been on for hours, i mean its not causing me any grief as my pc is operating flawlessly its just a little annoying when it doesnt shut off.

The only possible thing i think that may be causing this problem due to it only occuring after the system has been on for a long time is that the Mosfet heatsinks are not getting a lot of airflow as i was previously running a side panel with 4x 120mm fans on it, now its just a plexi window. CPU and GPU temperatures are well below the maximums due to the watercooling, temperatures system wide are pretty much the same interms of ambient case temperature but there are increases at full load in comparison to prior the water cooling upgrade of around 5-10 degrees on the NB (~40c) and SB (~65c-70c).

Any help or suggestions are much appreciated! If more information is required just ask.

Cheers.

 

[Veco]

I have the same issue with mines sometimes. It only happens occasionally so I've not tried to fix it. Though I'm guessing it's the motherboard as the psu is activated when current is drawn though the 5v or 12v (i forget which) pins on the motherboard power connector. It could also be the psu overheating or an internal temperature sensor is faulty and it's keeping its fans on because it thinks it's hot.

 

[panyan]

top end psu's keep the fan running until its components are cool - and then it shuts down - and yours is one of the best psu's

 

[feck199]

top end psu's keep the fan running until its components are cool - and then it shuts down - and yours is one of the best psu's

I'd say this.

Although I'm not sure that theses psu's normally kept other fans going other than theirs and water pump still goes?

But this was my first thought, is your psu just cooling down. Does it turn off if you come back to it?

 

[MNA24]

top end psu's keep the fan running until its components are cool - and then it shuts down - and yours is one of the best psu's

I thought it might be something like this, but i'll have to read up to see if it's a feature.

I'd say this.

Although I'm not sure that theses psu's normally kept other fans going other than theirs and water pump still goes?

But this was my first thought, is your psu just cooling down. Does it turn off if you come back to it?

I can't 100% confirm the water pump stays ive just got a slight doubt about that now, ill have to check next time it happens. All the Fans definatly keep going and the HDDs turn off but the green light on my SSD stays on. all the fans run off my motherboard and the waterpump (4pin molex) also has an RPM sensor connected to the mothboard which can be used to regulate speed of the pump (it isnt regulating speed atm just for RPM) and my lighting is 4pin molex inverter cathode. All LEDs on the motherboard are off.

As for seeing if it evently turns off, ive never left it more than 30 seconds in fear of it causing any damage. Should i just leave it next time for 5 mins or so to see if it shuts off? Would there be any risk of damage?

 

[panyan]

Should i just leave it next time for 5 mins or so to see if it shuts off? Would there be any risk of damage?

imho you have one the best psu's so i would be VERY surprised if this wasnt an actual feature and your probably doing it more damage by killing the power than just letting the psu do its proper shutdown routine

id be very interested to hear if this is an actual feature as i dont have one of these units

 

[BlackBat]

Lower power rated Corsairs do this, I would've expected the highest power rated Corsair to do the same, next time it happens go for a long visit to the smallest room, stop off to make a brew on your way back and you'll probably find it's shutdown fully by the time you return.

Then again, you may return to find your PC on fire.

 

[feck199]

imho you have one the best psu's so i would be VERY surprised if this wasnt an actual feature and your probably doing it more damage by killing the power than just letting the psu do its proper shutdown routine

id be very interested to hear if this is an actual feature as i dont have one of these units

This

You are likely cutting the power before the psu has cooled down to what it feels happy with depending on its mood at the time.

 

[MNA24]

Lower power rated Corsairs do this, I would've expected the highest power rated Corsair to do the same, next time it happens go for a long visit to the smallest room, stop off to make a brew on your way back and you'll probably find it's shutdown fully by the time you return.

Then again, you may return to find your PC on fire.

This

You are likely cutting the power before the psu has cooled down to what it feels happy with depending on its mood at the time.

Well next time it happens i'll let it do it's own thing to see if it will shut off, if not the smoke alarm above my PC will let me know it hasn't Cheers

 

[MNA24]

Turns out the problem is due to whenever i change the fan curves for my CPU and System fans in Asus AI suite II. I noticed in HWmonitor that i was getting some crazy high RPMs on fans and also extra fans listed that do not exist. There were also some temperature probes giving dodgy readings. When HWmonitor is kicking out these readings i can guarantee the PSU will not shut off properly.

So basically if i mess around with the fan settings in FanXpert which is part of the Asus AIsuite II it seems to bug out the motherboard causing the PSU not to shut off as its clearly effected the operation of the bios in general so it doesn't complete the power off procedure properly. If i dont make any changes in FanXpert then my PSU doesnt have any problems shutting down no matter how long my PC is on or how much stress it is put under.