Motherboard fan sounds like air-raid siren

I recently bought a rebuilt Windows 7 computer.

It works fine except for one thing. The fan on the motherboard sounds like hell.

A high, annoying sound which sounds like an air-raid siren and stays the same from the moment I start the computer until I shut it down.

It's very hard to concentrate with this constant monotone noice. During all the years I've worked with computers, I've never encountered something similar.

How can I solve the problem? is it possible to replace the fan or do I have to buy a new motherboard?

SIW2 said:

What is the machine? Could be the cpu cooler or the psu fan.

cpu coolers are cheap https://www.amazon.co.uk/Thermalrigh...dp/B0B8Z283NZ/

It might be the CPU cooler.
The fan is in the middle of the motherboard.

is it possible to replace only the fan or do I have to buy a new motherboard too?

In my experience, it didn't happen often. but once it occurred. the problem was hard to fix.

my 1st one was a new boxed AMD CPU and its motherboard. the CPU fan really loud. I never met the problem before. AMD mailed me a new fan. after replacement, not much improvement. I had to leave it that way then moved PC to another room as I couldn't work when it's in Office.

the 2nd one was when ASUS motherboard replacement. the board worked fine but CPU fan was running loud. I tried another CPU fan, re-seating CPU, adding CPU glue, , whatever I couldn't. per ASUS guide the board had a CPU fan control circuit. my conclusion that it must be NOT working any more. I had to let it retired.

my 3rd was a HP DM PC. this model typically run very quiet (good experience on HP 8000-8300, G1-G4). but this noisy one is right like you said, when running heavy load (data-processing, graphics, gaming, , , sounds like air-raid siren. I still use it sometimes.

my summary,
if it's a CPU fan problem. then likely fan replacement can solve the problem. but if it's an issue on CPU fan control circuit(built-in motherboard), then it's NOT easy to fix. or can be fixed at high cost.

yardbird said:

It works fine except for one thing. The fan on the motherboard sounds like hell.

SIW2 said:

It is easy to replace the cooler.

Is it tha machine listed in your specs ? B75M-PLUS and i5-3340

No, that's the old one which recently started to malfunction. I just haven't had the time to update my specs.

This is about the recent one:
Intel Core2Duo socket 775
8 GB DDR2 RAM
240 GB SSD SATA hard drive
Miditower chassi
500W net ATX
DVD burner
MOTHERBOARD SPECIFICATION :

Form Factor

ATX Motherboard (307 x 244 mm)

Processor

Intel® Core™2 Quad / Core™2 Duo Desktop / Pentium D LGA775 533/800/1066 FSB

Memory

4 x DDR2 533/667/800 MHz support up to 8.0 GB

Chipset

Intel® Q965 & ICH8DO Chipset

Real Time Clock

Chipset integrated RTC with onboard lithium battery

Watchdog Timer

Generates a system reset internal timer for 1min ~ 255 min

Power Management

ACPI 1.0 compliant, supports power saving mode ATX PSU

VGA Interface

Intel® Q965 integrated GMA 3000 Technology

Video Memory

Up to 256 MB shared with system memory

Serial ATA Interface

6 x Serial ATA II Interface with 300MB/s transfer rate Support RAID 0,1,5,10 function

Audio Interface

Intel® ICH8DO integrated with Realtek ALC888 HD Audio
LAN Interface

2 x Intel® 82573L Gigabit Ethernet Controller

GPIO Interface

Onboard programmable 8-bit digital I/O interface

Extend Interface

1 x PCI-Express X16 , 1 x PCI-Express X4 , 4 x PCI slots,

1 x Min-PCI , 2 x ISA slots

External I/O Port

2 x RJ45 LAN ports, 1x DB15 VGA port, 1 x PS/2 Keyboard / Mouse port , 1x RS232 Serial port , 6 x USB 2.0 ports , 1 x SPDIF , HD Audio ports

Internal I/O Port

1 x FDD, 1 x IrDA , 4 x USB 2.0 , 1 x Audio , 1 x LPT

1 x RS232/422/485 & 4 x RS232

Power Requirement

Standard 24-pin ATX power supply ( 20-pin is compatible)

Standard 8-pin 12V power Input connector

Board Dimension

307mm x 244 mm (L x W)

Operation Temperature

0 ~ 60oC (32 ~ 140oF)

- - - Updated - - -

siliconbeaver said:

In my experience, it didn't happen often. but once it occurred. the problem was hard to fix.

my 1st one was a new boxed AMD CPU and its motherboard. the CPU fan really loud. I never met the problem before. AMD mailed me a new fan. after replacement, not much improvement. I had to leave it that way then moved PC to another room as I couldn't work when it's in Office.

the 2nd one was when ASUS motherboard replacement. the board worked fine but CPU fan was running loud. I tried another CPU fan, re-seating CPU, adding CPU glue, , whatever I couldn't. per ASUS guide the board had a CPU fan control circuit. my conclusion that it must be NOT working any more. I had to let it retired.

my 3rd was a HP DM PC. this model typically run very quiet (good experience on HP 8000-8300, G1-G4). but this noisy one is right like you said, when running heavy load (data-processing, graphics, gaming, , , sounds like air-raid siren. I still use it sometimes.

my summary,
if it's a CPU fan problem. then likely fan replacement can solve the problem. but if it's an issue on CPU fan control circuit(built-in motherboard), then it's NOT easy to fix. or can be fixed at high cost.

I have to fix it, otherwise it will damage my hearing and the neighbors will start to complain soon. Honestly, I've used and worked with computers since 1994 and I've never encountered something like this.

And I'm not gonna pay more than I've already have done when it comes to this computer.

What if I pull the plug to the hellish fan and attach a new fan to the "wall" opposite the motherboard?