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HP desktop a1620n CPU cooler fan runs at max all the time

Posted on 2012-09-12
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Last Modified: 2012-09-22
HP Desktop (Md. a1620n) running W7.  The CPU cooler fan seems to run at max all the time regardless of CPU usage.  It didn't use to do this.   Is there anything I can do to control the fan speed?  I've checked the B IOS and did not see anything that allowed changes or any reference to CPU fans.  Will changing out the cooler make a difference?  The fan is running at 4100+ according to SPEEDFAN but that program is too complicated for me and besides I didn't see a way to control the fan with SPEEDFAN.  Any ideas on what I could do?  BTW, I've also removed dust from around the cooler just to see if that made a difference and it did no.
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Question by:tonyadam
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Expert Comment

by:Callandor
ID: 38390832
There may be a reason that the fan is running at 100% all the time - the cpu is too hot.  You may need to reseat the cpu heatsink, if it's not making good contact, or remove old thermal paste and apply a small amount of new.  Try CoreTemp to monitor the temperature and check task manager to see if something is running in the background (antivirus scan, for example).  Changing the cooler is a last resort, as the stock cooler is decent for regular operation.
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by:nobus
ID: 38393930
what cpu temperature is reported by speedfan?
you can compare that with the liste max temp for your cpu
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by:tonyadam
ID: 38395595
CoreTemp is reporting the following:  Intel Pentium D 925 (Presler)
Tj. Max - 75 c
Core #0 - 40 c
Core #1 - 40 c

Watching the load factors do not seem to change any of the temps.
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by:nobus
ID: 38395692
that seems pretty nice to me; 40 is just abit higher than room temp
so that means the cooler should not run all the time
check if you have a fan speed control in the BIOS
in advanced, or Power section
or update the bios
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=bph07110&lc=en&product=3245025
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Author Comment

by:tonyadam
ID: 38395716
I replaced the PSU sometime ago and I think this fast running fan started then.  What would a new PSU have to do with causing the fan to run fast.
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by:Callandor
ID: 38395860
Is this new PSU delivering the correct voltages?  You can test it with a dedicated tester: http://www.newegg.com/Product/Product.aspx?Item=N82E16899705003  You should not be getting more than 10% deviation from any of the voltage rails (+12v, +5v, +3.3v).
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Author Comment

by:tonyadam
ID: 38396344
Here are my voltages:
Sys standard    My voltages
+5V                     5.1
+12                     12.5
+3.3                      3.3
-12v                     11.9
+12V2                  12.5
5VSB                      5.2
PG                       420ms
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by:Callandor
ID: 38396578
Those voltages look fine.  Try resetting the BIOS - there usually is a jumper near the CMOS battery which you move from pins 1-2 to 2-3, and then back, or remove the CMOS battery for 5 min.
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by:nobus
ID: 38397819
or update the bios, as said
there are others with your problem :  http://www.fixya.com/support/t2552308-a1620n_hp_desktop_recently

so maybe contact HP for a solution?
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Accepted Solution

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tonyadam earned 0 total points
ID: 38406674
Decided to use a Zalman fan controller so will delete the question.  Thanks for everyone's repsonses.
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Author Closing Comment

by:tonyadam
ID: 38424384
Could not fix.  Assume that this is either a MOBO or fan issue.  Will use a fan controller so that we can manually control outside the tower.
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