Sometime my case fan doesn't work when I turn on my pc

khjhpopasa · Jan 2, 2023

Sometime my case fan doesn't work when I turn on my pc
I got 5 fans in my case PC and two of them sometime stay off on my bios he doesn't recognize them but sometimes that the problem.

my motherboard is B650 aorus elite ax and I got a new pc.
So the problem should be on case fans or motherboard? cosue it happened sometimes.

and some times the fan turn up 3 second after click on power button some some immediately

claes · Jan 2, 2023

How many fans do you have connected per header?

nomdeplume · Jan 3, 2023

... and how many kW of RGB are you attempting to pull from the board? :laugh:

Sounds like fans go over the peak draw BIOS is happy providing during Post. If you hit the safety limit it mostly just ignores them to deal with bigger things. Until it doesn't.
Fan controller probably fixes this unless you psu is underpowered for build.

khjhpopasa · Jan 3, 2023

claes said:
How many fans do you have connected per header?

two from my cpu (cpu fan + opt fan) and more two fans to one connector with cable - that my header and all of them work well.
and i has in middle more fan work well
and more two fans on bottom work sometimes on turn on

nomdeplume said:
... and how many kW of RGB are you attempting to pull from the board?

Sounds like fans go over the peak draw BIOS is happy providing during Post. If you hit the safety limit it mostly just ignores them to deal with bigger things. Until it doesn't.
Fan controller probably fixes this unless you psu is underpowered for build.

So what I should to do?
I have some fans connection look comment above, four of them with RGB my PSU 1000W

droopyRO · Jan 3, 2023

Your fans probably don't recive enough voltage to start. See on what connector they are plugged in and either set the fans to manual in BIOS and set them at a higher rpm or set them to start spinning with CPU temperature.

khjhpopasa · Jan 3, 2023

droopyRO said:
Your fans probably don't recive enough voltage to start. See on what connector they are plugged in and either set the fans to manual in BIOS and set them at a higher rpm or set them to start spinning with CPU temperature.

But case and mother motherboard do well? and not a real problem?

nomdeplume · Jan 3, 2023

khjhpopasa said:
But case and mother motherboard do well? and not a real problem?

nomdeplume said:
If you hit the safety limit it mostly just ignores them to deal with bigger things.

Exactly what I said. Mobo priortizes cpu and other critical functions over an accessory fan. Each boot is unique enough sometimes it just can't manage to divert enough wasted attempts to get every fan working.

6 fan headers and a total of 7 fans makes you a fine candidate for a fan controller.
Remove everything to it other than your rear exhaust and cpu/cpu opt which the board expects and will manage.

khjhpopasa · Jan 3, 2023

nomdeplume said:
Exactly what I said. Mobo priortizes cpu and other critical functions over an accessory fan. Each boot is unique enough sometimes it just can't manage to divert enough wasted attempts to get every fan working.

6 fan headers and a total of 7 fans makes you a fine candidate for a fan controller.
Remove everything to it other than your rear exhaust and cpu/cpu opt which the board expects and will manage.

But i need all of them, and anyway my case support that so if cases support so much fans it should work

claes · Jan 3, 2023

Fill out your system specs on your profile please

nomdeplume · Jan 4, 2023

khjhpopasa said:
But i need all of them, and anyway my case support that so if cases support so much fans it should work

Case is the least significant factor in the power of your computer.

This is the real world where sometimes things don't work perfectly. Please fill out your system specs and consider the opportunity to resolve this issue.

Lei · Jan 4, 2023

@khjhpopasa
Disconnect some of the fans and see if it works.

Connect the CPU fan directly with no header.

khjhpopasa · Jan 4, 2023

claes said:
Fill out your system specs on your profile please

7600x
7900x xtx
6400 16*2

Lei said:
@khjhpopasa
Disconnect some of the fans and see if it works.

Connect the CPU fan directly with no header.

my cpu fan has two fans and they work well

nomdeplume said:
Case is the least significant factor in the power of your computer.

This is the real world where sometimes things don't work perfectly. Please fill out your system specs and consider the opportunity to resolve this issue.

did above

Lei · Jan 4, 2023

khjhpopasa said:
my cpu fan has two fans and they work well

I know, disconnect one of them and see if those two fans down there change their behaviour.

Do you have any software controlling fan speed. May be your sleepy fans are set to 0rpm when something is not warm enough.

claes · Jan 4, 2023

khjhpopasa said:
7600x
7900x xtx
6400 16*2

my cpu fan has two fans and they work well

did above

Please do it properly and, surprise, to help with your fans we need to know what motherboard you’re using and which and how many fans, might even need to know your case, too

khjhpopasa · Jan 4, 2023

claes said:
Please do it properly and, surprise, to help with your fans we need to know what motherboard you’re using and which and how many fans, might even need to know your case, too

motherboard post in first comment^

Lei said:
I know, disconnect one of them and see if those two fans down there change their behaviour.

Do you have any software controlling fan speed. May be your sleepy fans are set to 0rpm when something is not warm enough.

No, because motherbaord just not recognized them when I get that bug.

When I use more speed of fan for now it work well it can fix that issue?

System Name	boomer--->zoomer not your typical millenial build
Processor	i5-760 @ 3.8ghz + turbo ~goes wayyyyyyyyy fast cuz turboooooz~
Motherboard	P55-GD80 ~best motherboard ever designed~
Cooling	NH-D15 ~double stack thot twerk all day~
Memory	16GB Crucial Ballistix LP ~memory gone AWOL~
Video Card(s)	MSI GTX 970 ~~GOLDEN EDITION~~ RAWRRRRRR
Storage	500GB Samsung 850 Evo (OS X, *nix), 128GB Samsung 840 Pro (W10 Pro), 1TB SpinPoint F3 ~best in class
Display(s)	ASUS VW246H ~best 24" you've seen FULL HD 1O80PP SLAPS~
Case	FT02-W ~the W stands for white but it's brushed aluminum except for the disgusting ODD bays; cries
Audio Device(s)	A LOT
Power Supply	850W EVGA SuperNova G2 ~hot fire like champagne~
Mouse	CM Spawn ~cmcz R c00l seth mcfarlane darawss~
Keyboard	CM QF Rapid - Browns ~fastrrr kees for fstr teens~
Software	integrated into the chassis
Benchmark Scores	9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

Processor	Intel i5 8400
Motherboard	Asus Prime H370M-Plus/CSM
Cooling	Scythe Big Shuriken & Noctua NF-A15 HS-PWM chromax.black.swap
Memory	8GB Crucial Ballistix Sport LT DDR4-2400
Video Card(s)	ROG-STRIX-GTX1060-O6G-GAMING
Storage	1TB 980 Pro
Display(s)	Samsung UN55KU6300F
Case	Cooler Master MasterCase Pro 3
Power Supply	Super Flower Leadex III 750w
Software	W11 Pro

Processor	Intel i5 8400
Motherboard	Asus Prime H370M-Plus/CSM
Cooling	Scythe Big Shuriken & Noctua NF-A15 HS-PWM chromax.black.swap
Memory	8GB Crucial Ballistix Sport LT DDR4-2400
Video Card(s)	ROG-STRIX-GTX1060-O6G-GAMING
Storage	1TB 980 Pro
Display(s)	Samsung UN55KU6300F
Case	Cooler Master MasterCase Pro 3
Power Supply	Super Flower Leadex III 750w
Software	W11 Pro

System Name	boomer--->zoomer not your typical millenial build
Processor	i5-760 @ 3.8ghz + turbo ~goes wayyyyyyyyy fast cuz turboooooz~
Motherboard	P55-GD80 ~best motherboard ever designed~
Cooling	NH-D15 ~double stack thot twerk all day~
Memory	16GB Crucial Ballistix LP ~memory gone AWOL~
Video Card(s)	MSI GTX 970 ~~GOLDEN EDITION~~ RAWRRRRRR
Storage	500GB Samsung 850 Evo (OS X, *nix), 128GB Samsung 840 Pro (W10 Pro), 1TB SpinPoint F3 ~best in class
Display(s)	ASUS VW246H ~best 24" you've seen FULL HD 1O80PP SLAPS~
Case	FT02-W ~the W stands for white but it's brushed aluminum except for the disgusting ODD bays; cries
Audio Device(s)	A LOT
Power Supply	850W EVGA SuperNova G2 ~hot fire like champagne~
Mouse	CM Spawn ~cmcz R c00l seth mcfarlane darawss~
Keyboard	CM QF Rapid - Browns ~fastrrr kees for fstr teens~
Software	integrated into the chassis
Benchmark Scores	9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

Processor	Intel i5 8400
Motherboard	Asus Prime H370M-Plus/CSM
Cooling	Scythe Big Shuriken & Noctua NF-A15 HS-PWM chromax.black.swap
Memory	8GB Crucial Ballistix Sport LT DDR4-2400
Video Card(s)	ROG-STRIX-GTX1060-O6G-GAMING
Storage	1TB 980 Pro
Display(s)	Samsung UN55KU6300F
Case	Cooler Master MasterCase Pro 3
Power Supply	Super Flower Leadex III 750w
Software	W11 Pro

Processor	3900x - Bykski waterblock
Motherboard	MSI b450m mortar max BIOS Date 27 Apr 2023
Cooling	αcool 560 rad - 2xPhanteks F140XP
Memory	Micron 32gb 3200mhz ddr4
Video Card(s)	Colorful 3090 ADOC active backplate cooling
Storage	WD SN850 2tb ,HP EX950 1tb, WD UltraStar Helioseal 18tb+18tb
Display(s)	24“ HUION pro 4k 10bit
Case	aluminium extrusions copper panels, 60 deliveries for every piece down to screws
Audio Device(s)	sony stereo mic, logitech c930, Gulikit pro 2 + xbox Series S controller, moded bt headphone 1200mAh
Power Supply	Corsair RM1000x
Mouse	pen display, no mouse no click
Keyboard	Microsoft aio media embedded touchpad (moded lithium battery 1000mAh)
Software	Win 11 23h2 build 22631
Benchmark Scores	cine23 20000