View Full Version : cpu fan not working
HI just built a new pc with intel E2180 cpu stock cooling and asus P5K-VM mobo everythings fine except the cpu fan isnt working.Got the fan plugged into mobo but when I boot up I get the message cpu fan error,now am I missing something and is there a way to find out if the fan is faulty or the mobo?
Glad to see you bought the bits...
Have you tried the fan on another connector?
Hi wonderlust yea very pleased with the kit thx for all your help why are these things never easy!!!! I didnt know if there were any other connetors ill check mobo manual
only seems to be 1 4 pin connecrion can I connect to 3 pin pwr fan connector?
yes you can the connector is slotted for that too
ok fans working but i still get cpu fan error on boot should i worry about this?
My system seem to show 「CPU fan error」message at POST under some conditions in particular.
Can you please kindly advice on what this message represents, and ways to bypass this error message automatically.
http://support.asus.com/images/arrow-001O.gif AnswerThis error message represents system detected 「either the onboard CPU fan connector is not connected, or if CPU fan speed detected during POST stage has gone below the lower limit.」
The possible causes of system showing such error message includes:
1. Onboard CPU fan connector has not been connected to 3pin or 4pin CPU fan.
2. CPU fan speed at POST stage has gone below 600RPM for Intel motherboards, and 800RPM for AMD motherboards.
If your CPU fan has low speed, or CPU fan has only 2 pin, or you are not using CPU fan connector, you can bypass this error message by entering BIOS setup screen, and set 「CPU Fan Speed」option to 「Disabled」to bypass this error message at POST.
Plug it back into the other socket and see if it starts spinning after a while?
It may be worth turning off qfan in the bios to see if that makes a difference
okay will do so basically the message is coming up because i have it plugged into 3 pin instead of 4 and i can disable the message in bios.Im gonna get some software to monitor temps to keep an eye on it
I would turn off the qfan and see if the fan then turns when connected to the 4 pin connector.
If it does, I guess that the cpu temp is so low that it isn't turning the fan. There, i would imagine, be a setting to change the temperature that the fan starts to cool.
You may have to lower this.
ive got no power at all now plugged the power supply fan connector into moobo and now ive got no power help
unplug the fan and try again?
have done still no power led light on the board is on
disconnect psu from the mains, it may have tripped.
ive done that still no power
all connectors plugged in?
yea eveything in im just checking if mobo has touched the case while i was plugging/unplugging
ok, it may take the psu a few minutes to reset if it has tripped
If the psu has tripped would i get the led light on the mobo?
if it was tripped by a short no. did you unplug the fan connector? have you checked you haven't got any standoffs where they shouldn't be?
all fan connectors are unplugged standoffs are in the sameplace they were when i had power its DRIVING ME CRAZY!!!!!
Do you have another PSU (in another PC)?
only the one im talking to you on
may be worth exchanging them, it will rull out if there is an issue with the psu in the case
im a bit wary as i cant talk to you then
ah I see, know any one else that may have a spare?
no noone i know of short of stripping down there pc i keep coming back to the led on the mobo if the psu is duff i dont think id get that light
Ah sorry I missunderstood, the led is on! I thought you ment it was off!
no its on which makes it a bit wierd
ok, if you turn the psu off and then (with it off) turn on the pc does the light go out as soon as you press the button?
no the light is on the mobo it goes on as soon as i plug the psu into the mains
please re read post 31
not sure what you mean buy turning psu on or off, as soon as i unplug the psu the light goes off.I dont get anything from the pc on/off button whether the psu is plugged in or not
ok, most psu's i have used in recent times keep the board powered for a minute or so after turning the psu off.
by pressing the power button the light goes out instantly.
I was hoping to confirm that a. the power button is on the correct connector. B. the power button is working correctly.
Have you tried to reset the CMOS? the manual will tell you how/ where
cant see anything in the manual ill keep looking
it says something about clearing the real time clock in cmos by removing the battery is that it?
First time I have seen a board manufacturer talk about removing the battery!
yes thats the correct bit, just try the jumper bit 1st
no still dead lights still on the mobo
ok, remove every cable from the board.
connect the two power leads (the 20/24 and the 4/8 depending what you have)
connect the cpu fan
connect just the power switch then try powering it up
ok, swap the power switch for the reset one and try again
obviously using reset as power switch
ok, only thing left to try before swapping the psu is to remove the board from the case and the psu and setting it up on the desk (box the board came in makes a good stand)
connect just the psu and reset (try with and with out the cpu fan connected)
This will confirm that there is no shorting on the case.
If this fails then I would be inclinded to swap the psu with the pc you are using to confirm that it is either the psu or the board
ok pcs in three million bits but managed to get mobo out ony psu and power button connected nothing still dead do you think somethings gone on the board or the on/off switch is faulty?
swapping the reset for the on off wwas to find out if on off switch was faulty.
next thing to do if you wish to (only way to confirm if psu is faulty) is to swap the two psu's over.
that will confirm if the board is at fault or the psu
do you think id be better off taking them back on monday?
what if i tried another board i have a spare somewhere
well the choice is yours.
I am a tinkerer so I would use another psu to test the board. Aria can test on monday if you are not happy disconnecting a perfecly good machine, lots of people use the "if it's not broken, dont fix it" line
what if i tried another board i have a spare somewhere
If the PSU is faulty (possibly over volting etc) it could have killed the new board, might also kill your spare board!
if i try another board and that works would that confirm the board is faulty?
ok i dont need the board ill try that either way somethings not right board or psu so im probably going back on monday anyway
ok, good luck!
thanks for all your help if it could be fixed i know you would have done it
how did you get on with the other board?
so looks like the psu?
yea looks like puzzling why i got led power light on the board tho
it could be giving 12v but no 5v or enough amps to light an led but not fire up the system.
If they confirm that the psu is faulty and if they swap the case for another I woudl suggest you invest in a new quality psu asap.
If you look in the last couple of days posts there has been lots of suggestions...
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