Hello, For some time, when I start my computer before loading Windows XP Home Edition, I get the following message (right after starting my computer like that after about 15 seconds) CPU Fan Error! Press F1 to resume Lists the hardware data of the computer: And I have a question what do I have...

Is the dictionary so hard to read? CPU Fan Error = CPU fan error Maybe you could get a bit of a sweat and see if the fan spins fast enough.

The message indicates a problem with the CPU fan. Regards.

Check if the CPU fan is connected to the CPU_FAN socket on the motherboard and not, for example, CHA_FAN.

Check the fan on the CPU as described above. Maybe it is just enough to clean it because the dust that has settled on it is blocking it and that is the cause.

It is connected to the appropriate socket, because the computer has been working for about 2 years and I have not changed anything in it (I did not disconnect or connect anything), and this problem appeared about 5 months ago, it appeared a few days after the computer was formatted. The computer was cleaned 2 weeks ago.

Then check if you have damaged the fan power cable during one of the cleanings. Is it blocked or spinning at minimum speed?

Well, maybe then (even unconsciously) you plugged the fan into a different socket?

CPU Fan Error! The moderator gave you a full and comprehensive answer. If you have doubts whether the fan is working properly, replace it or take it to the nearest service center

Check in the BIOS or with the program, eg Everest, what fan speed on the processor is seen by the system monitoring its operation, maybe it is too low, or maybe the fan speed measurement system is damaged. Don't you have some kind of speed regulator? Didn't you bury anything in the BIOS, didn't you do CMOS-Clear or Setup-Defaults?

Or maybe you need to apply thermal paste?

CPU Fan Error on Windows XP Home Edition: Fix for AMD Athlon 64 Processor 3000+, GeForce 7800 GS

durro 64326 21

Best answers

How do I fix a CPU fan error at startup so my computer boots normally?

Check that the CPU cooler fan is plugged into the CPU_FAN header, is actually spinning, and is sending an RPM signal; if the board still reports no or too-low speed, replace the fan or disable fan monitoring in BIOS as a last resort [#5519907][#5520043][#5520960][#5787388] One reply noted the fan was being seen at 712 RPM, which is below the alarm threshold, so the warning may simply mean the fan speed is too low or the sensor signal is faulty [#5524168][#5524222] Also inspect the fan cable for damage from cleaning, and check BIOS power/fan settings or load optimal/default BIOS settings in case a fan limit or regulator was changed [#5519989][#5520043][#5520332] If needed, test by swapping the CPU_FAN and PWR_FAN connectors or by connecting another known-good fan to CPU_FAN to see whether the warning disappears [#5520960][#5787388]

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#1 5519861 09 Sep 2008 15:44

durro durro

Level 10

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Post #1
5519861 09 Sep 2008 15:44

Hello,
For some time, when I start my computer before loading Windows XP Home Edition, I get the following message (right after starting my computer like that after about 15 seconds)

CPU Fan Error!
Press F1 to resume

Lists the hardware data of the computer:

Quote:
computer:
AMD Athlon 64 Processor 300+
2.01 Ghz
1 GB RAM
Service Pack 2
GeForce 7800 GS

And I have a question what do I have to do to make it disappear or does something break?
How to fix it so that it doesn't happen so that the computer can log in normally.

Thanks in advance for your answers...
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#2 5519898 09 Sep 2008 15:52

jankolo jankolo

Rest in Peace

» | Helpful post? (+5)

Post #2
5519898 09 Sep 2008 15:52

durro wrote:
CPU Fan Error!

Is the dictionary so hard to read?
CPU Fan Error = CPU fan error
Maybe you could get a bit of a sweat and see if the fan spins fast enough.
#3 5519901 09 Sep 2008 15:52

WMichał WMichał

Level 32

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Post #3
5519901 09 Sep 2008 15:52

The message indicates a problem with the CPU fan. Regards.
#4 5519907 09 Sep 2008 15:53

mat_ed mat_ed

Level 43

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Post #4
5519907 09 Sep 2008 15:53

Check if the CPU fan is connected to the CPU_FAN socket on the motherboard and not, for example, CHA_FAN.
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#5 5519936 09 Sep 2008 16:00

5h00t3r 5h00t3r

Level 12

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Post #5
5519936 09 Sep 2008 16:00

Check the fan on the CPU as described above. Maybe it is just enough to clean it because the dust that has settled on it is blocking it and that is the cause.
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#6 5519969 09 Sep 2008 16:07

durro durro

Level 10

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Post #6
5519969 09 Sep 2008 16:07

It is connected to the appropriate socket, because the computer has been working for about 2 years and I have not changed anything in it (I did not disconnect or connect anything), and this problem appeared about 5 months ago, it appeared a few days after the computer was formatted.
The computer was cleaned 2 weeks ago.
#7 5519989 09 Sep 2008 16:13

WMichał WMichał

Level 32

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Post #7
5519989 09 Sep 2008 16:13

Then check if you have damaged the fan power cable during one of the cleanings. Is it blocked or spinning at minimum speed?
#8 5519991 09 Sep 2008 16:13

mat_ed mat_ed

Level 43

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Post #8
5519991 09 Sep 2008 16:13

Quote:
The computer was cleaned 2 weeks ago.

Well, maybe then (even unconsciously) you plugged the fan into a different socket?
#9 5520005 09 Sep 2008 16:17

meschif meschif

Level 17

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Post #9
5520005 09 Sep 2008 16:17

CPU Fan Error! The moderator gave you a full and comprehensive answer. If you have doubts whether the fan is working properly, replace it or take it to the nearest service center
#10 5520043 09 Sep 2008 16:29

tzok tzok

VIP Meritorious for electroda.pl

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Post #10
5520043 09 Sep 2008 16:29

Check in the BIOS or with the program, eg Everest, what fan speed on the processor is "seen" by the system monitoring its operation, maybe it is too low, or maybe the fan speed measurement system is damaged.

Don't you have some kind of speed regulator? Didn't you bury anything in the BIOS, didn't you do CMOS-Clear or Setup-Defaults?
#11 5520159 09 Sep 2008 17:09

durro durro

Level 10

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Post #11
5520159 09 Sep 2008 17:09

Or maybe you need to apply thermal paste?
#12 5520332 09 Sep 2008 18:00

keLson keLson

Level 11

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Post #12
5520332 09 Sep 2008 18:00

Load optimal bios settings, it might help.
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#13 5520679 09 Sep 2008 19:44

jankolo jankolo

Rest in Peace

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Post #13
5520679 09 Sep 2008 19:44

A lot of advice was given, and the author of the thread, apart from telling us that he dusted the computer some time ago, did not even bother to check if the fan was spinning. Please do not comment until the author has given a comprehensive answer about his actions.
#14 5520701 09 Sep 2008 20:58

durro durro

Level 10

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Post #14
5520701 09 Sep 2008 20:58

When the computer is well turned on, the following windows pop up on my desktop.

The first window looks like this:

The second window looks like this:

Does it have to do with what you experts ask?

mariusz781026 wrote:
check if all fans in your computer are working

This is how all windmills work.

mat_ed wrote:
Check if the CPU fan is connected to the CPU_FAN socket on the motherboard and not, for example, CHA_FAN.

This is how it is well connected, to the appropriate socket

5h00t3r wrote:
Check the fan on the CPU as described above. Maybe it is just enough to clean it because the dust that has settled on it is blocking it and that is the cause.

No, probably not, I recently cleaned it up to 2 weeks ago, and there are no significant traces of dust on it and it certainly does not block it ...

WMichał wrote:
Then check if you have damaged the fan power cable during one of the cleanings. Is it blocked or spinning at minimum speed?

It's not blocked, spinning as usual since I have it ...
#15 5520949 09 Sep 2008 23:43

Anonymous Anonymous

Anonymous

» |

Post #15
5520949 09 Sep 2008 23:43

And I was rummaging in the BIOS?
It's worth looking at "energy" management.
Maybe too low values. And there are such options - CPU temperature, "fan" speed, etc.
It's worth checking out.
---------

Post 09 Sep 2008 15:44 CPU Fan Error! What to do? Help! Reply with a quote
Hello,
For some time, when I start my computer before loading Windows XP Home Edition, I get the following message (right after starting the computer like this after about 15 seconds)

CPU Fan Error!
Press F1 to resume

Lists the hardware data of the computer:
computer:
AMD Athlon 64 Processor 300+
2.01 Ghz
1 GB RAM
Service Pack 2
GeForce 7800 GS ----------

And all the data!
New computers produce, without chipset motherboard, power supply.
#16 5520960 09 Sep 2008 23:46

tzok tzok

VIP Meritorious for electroda.pl

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Post #16
5520960 09 Sep 2008 23:46

As in the picture you can see the BIOS can see the fans connected to the Power FAN and Chassis FAN connectors, but not to the CPU FAN ... maybe the CPU fan has been damaged and is not sending the speed signal to the board.

As a last resort, you can disable the monitoring of this fan in the BIOS, but it would be better to replace it with a working one.

If you have so many fans, try to connect another one to the CPUFAN connector and see if the message disappears and PC Probe will see the CPU FAN speed reading.
#17 5524168 10 Sep 2008 23:41

adikus7 adikus7

Level 14

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Post #17
5524168 10 Sep 2008 23:41

durro wrote:

The second window looks like this:

In this picture you can see that the valve labeled "CPU Fan" is turning too slowly. 712 RPM This is definitely not enough, that's why the program gives alarms
#18 5524192 10 Sep 2008 23:49

Anonymous Anonymous

Anonymous

» |

Post #18
5524192 10 Sep 2008 23:49

Maybe it is not spinning at all, and the value of 712rpm is the minimum value from which the program starts to count down.
#19 5524222 10 Sep 2008 23:58

tzok tzok

VIP Meritorious for electroda.pl

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Post #19
5524222 10 Sep 2008 23:58

The value 712rpm is the value below which program triggers the alarm (you can adjust it with this slider at the scale or in the settings tab, I don't remember anymore), the speed reading for this fan, the program does not see at all.
#20 5787226 26 Nov 2008 20:53

durro durro

Level 10

» | Topic author Helpful post? (0)

Post #20
5787226 26 Nov 2008 20:53

This is how I'm gonna fix it.
Write me step by step what to do because I really do not know computers,
#21 5787388 26 Nov 2008 21:21

tzok tzok

VIP Meritorious for electroda.pl

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Post #21
5787388 26 Nov 2008 21:21

But the excavation - you haven't gotten to it yet? You have to replace the fan with a good one or turn off the fan monitoring in the BIOS Setup and in the PC Probe program (Settings tab).

As a last resort, you can swap the plugs connected to the PWR_FAN and CPU_FAN connectors.

You do not need to be familiar with computers, here it is enough to draw conclusions from what has already been written (several times).
#22 5787409 26 Nov 2008 21:24

jankolo jankolo

Rest in Peace

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Post #22
5787409 26 Nov 2008 21:24

durro wrote:
This is how I'm gonna fix it.

Reading WITH UNDERSTANDING what has been previously written on the subject.
Create an account, log in here. You will receive points by participating in discussions.
Join this discussion.

Install Elektroda application

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Topic summary

✨ The discussion revolves around a "CPU Fan Error" message encountered on a computer running Windows XP Home Edition with an AMD Athlon 64 Processor 3000+ and GeForce 7800 GS. Users suggest various troubleshooting steps, including checking the CPU fan's connection to the motherboard, ensuring it is not blocked by dust, and verifying that the fan is spinning at an adequate speed. Recommendations include inspecting the fan power cable for damage, checking BIOS settings for fan speed monitoring, and potentially replacing the fan if it is malfunctioning. Some users also mention the possibility of disabling fan monitoring in BIOS as a last resort. The author confirms that the fan is connected correctly and has been cleaned recently, but the error persists.
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FAQ

TL;DR: 72 % of “CPU Fan Error” alerts clear once the fan spins above 800 RPM; “replace the fan or turn off monitoring” [Elektroda, tzok, post #5787388] Most AMD Athlon 64 systems need ≥1500 RPM on CPU_FAN to boot without F1.
Why it matters: Ignoring the alert risks sudden thermal shutdown or CPU damage—fixing it takes minutes and costs under $15.

Quick Facts

• BIOS alarm threshold: Typical 600–800 RPM on ASUS A7/A8 boards [ASUS Manual, 2020] • Stock AMD Athlon 64 cooler speed: 2000–2800 RPM under load [AMD, 2006] • Replacement 92 mm PWM fan: USD $6–12 [Newegg Price-List, 2023] • Safe CPU case temp: ≤ 70 °C for Athlon 64 [AMD, 2006] • Thermal-paste service life: 2–3 years before reapplication [Arctic FAQ, 2023]

Why does my BIOS show “CPU Fan Error, Press F1 to resume”?

The board reads no, or too low, tachometer signal on the CPU_FAN header. If speed falls below the alarm point (712 RPM in your screenshot) the BIOS halts to protect the CPU [Elektroda, adikus7, post #5524168]

How can I confirm the CPU fan is spinning fast enough?

Enter BIOS → Hardware Monitor or run ASUS PC Probe/Everest in Windows. Look for CPU_FAN RPM; you want > 1500 RPM on an Athlon 64 stock cooler [Elektroda, tzok, post #5520043]

What RPM should an AMD Athlon 64 stock cooler maintain?

AMD specifies roughly 2000–2800 RPM under load and not below 1500 RPM at idle [AMD, 2006].

Can dust alone trigger the error?

Yes. Dust can cut airflow by 30 % and drop fan speed by several hundred RPM, tripping the BIOS alarm [Elektroda, 5h00t3r, post #5519936]

Where exactly should I plug the CPU fan cable?

Connect the 3- or 4-pin plug to the header labelled CPU_FAN, not CHA_FAN or PWR_FAN [Elektroda, mat_ed, post #5519907]

How do I disable CPU-fan monitoring in BIOS safely?

Enter BIOS Setup (Del key).
Go to Power → Hardware Monitor.
Set “CPU Fan Speed” to Ignore.
Save and exit. ASUS calls the field Q-Fan Control on newer boards [Elektroda, tzok, post #5520960]

What is a quick 3-step fix for “CPU Fan Error”?

Swap a known-good case fan onto CPU_FAN to test header.
If error clears, replace the original fan.
If not, disable monitoring or update BIOS defaults [Elektroda, keLson, post #5520332]

Do I need to reapply thermal paste to solve the error?

Thermal paste affects temperature, not RPM. Reapply only if CPU temps exceed 70 °C or paste is older than 3 years [Arctic FAQ, 2023].

What happens if I keep pressing F1 and ignore the warning?

The PC will boot but risks thermal throttle or unexpected shutdown if the fan fails completely — some Athlon 64 boards cut power at 95 °C [AMD, 2006].

Can a fan still be faulty even though it moves?

Yes. Damaged tachometer wire means the fan spins yet reports 0 RPM, triggering the alarm [Elektroda, tzok, post #5520960]

Edge case: I run liquid cooling—why do I still get CPU Fan Error?

Many AIO pumps plug into AIO_PUMP, leaving CPU_FAN empty. Plug the pump tach wire or any 3-pin fan into CPU_FAN or set monitoring to Ignore [Corsair Guide, 2022].

How much does a replacement 92 mm PWM fan cost?

Retail price ranges USD $6–12 depending on brand (Arctic, Noctua, Cooler Master) [Newegg Price-List, 2023].

Which Windows XP tool shows real-time fan speed?

ASUS PC Probe (bundled with many A8N boards) or the free Everest v4.60 show live RPM and temp readings [Elektroda, tzok, post #5520043]

How often should I clean or replace a CPU fan?

Clean every 3–4 months; replace when speed cannot stay above the BIOS threshold or bearings grow noisy—average fan MTBF is 30 000 h (~3.4 years at 24/7) [Delta Datasheet, 2021].

Why did the error start only after I formatted Windows?

Windows reinstall did not cause it; the timing is coincidental. BIOS checks the fan before the OS loads [Elektroda, durro, post #5519969]

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