Case fan on new PC won't start without push

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Tomgar24

Member
Hey guys, wondering if you fine folks could give me a hand. I just got my PC on Tuesday there and everything was working fine until yesterday when I saw that the back case fan wasn't spinning. The RGB lights were still on but the fan was totally still, so I opened up the case and as soon as I touched the fan it started up again. The problem seems to be persisting for now. Any advice on how to fix this issue?

Full spec:

Case
PCS 6003B BLACK CASE
Processor (CPU)
AMD Ryzen 5 3600 Six Core CPU (3.6GHz-4.2GHz/36MB CACHE/AM4)
Motherboard
ASUS® PRIME B450-PLUS (DDR4, USB 3.1, 6Gb/s) - RGB Ready!
Memory (RAM)
16GB Corsair VENGEANCE DDR4 2400MHz (2 x 8GB)
Graphics Card
6GB ASUS DUAL GEFORCE RTX 2060 - HDMI, DP, DVI
1st Storage Drive
1TB PCS 2.5" SSD, SATA 6 Gb (520MB/R, 470MB/W)
Power Supply
CORSAIR 450W CV SERIES™ CV-450 POWER SUPPLY
Power Cable
1 x 1 Metre UK Power Cable (Kettle Lead)
Processor Cooling
STANDARD AMD CPU COOLER
Thermal Paste
ARCTIC MX-4 EXTREME THERMAL CONDUCTIVITY COMPOUND
Extra Case Fans
1x 120mm Black Case Fan (configured to extract from rear/roof)
Sound Card
ONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
Network Card
10/100/1000 GIGABIT LAN PORT (Wi-Fi NOT INCLUDED)
Wireless Network Card
WIRELESS 802.11N 300Mbps/2.4GHz PCI-E CARD
USB/Thunderbolt Options
MIN. 2 x USB 3.0 & 2 x USB 2.0 PORTS @ BACK PANEL + MIN. 2 FRONT PORTS
Operating System
Windows 10 Home 64 Bit - inc. Single Licence [KK3-00002]
Operating System Language
United Kingdom - English Language
Windows Recovery Media
Windows 10 Multi-Language Recovery Image - Unlimited Downloads from Online Account
Office Software
FREE 30 Day Trial of Microsoft 365® (Operating System Required)
Anti-Virus
BullGuard™ Internet Security - Free 90 Day License inc. Gamer Mode
Browser
Google Chrome™
Keyboard & Mouse
ASUS TUF K1 Gaming Keyboard & M3 Mouse Bundle
Warranty
3 Year Standard Warranty (1 Month Collect & Return, 1 Year Parts, 3 Year Labour)
Delivery
STANDARD INSURED DELIVERY TO UK MAINLAND (MON-FRI)
Build Time
Standard Build - Approximately 14 to 16 working days
Welcome Book
PCSpecialist Welcome Book - United Kingdom & Republic of Ireland
Logo Branding
PCSpecialist Logo
 
T

Tomgar24

Member
NoddyPilot said:
Was it spinning when you first received it?

Have you used any fan control software such as ASUS AI Suite since then?
Click to expand...
Yeah, it was spinning when I first got it, it's only been the past couple of days that it's stopped. I've not used any software and everything seems pretty well connected, I checked the BIOS settings and my fan's set to run regardless of temperature. I can unscrew the glass panel and take a photo of the wiring if that might help?
 
NoddyPirate

NoddyPirate

Grand Master
Tomgar24 said:
Yeah, it was spinning when I first got it, it's only been the past couple of days that it's stopped. I've not used any software and everything seems pretty well connected, I checked the BIOS settings and my fan's set to run regardless of temperature. I can unscrew the glass panel and take a photo of the wiring if that might help?
Click to expand...
It's most likely a fan issue then I imagine.

However - those extra fans are three pin 12 Volt DC fans - they can be controlled by varying the DC voltage to vary the speed. With 12 Volts they run at full speed, but they normally need at least 7 Volts supplied to get started from a standstill in the first place - and then once they are running they can keep going with a lower voltage than that. Sometimes, if the fan header they are plugged into isn't fully configured correctly, on startup it doesn't give enough voltage to get the fan turning, but if you give them a spin by hand they spin up and continue going.

Now, there is no reason to believe that this is the case with your fan as it worked before and you haven't changed anything, but it would be good to rule out a fan header issue. Can you trace the wires and see where the fan is plugged into? There will be a little name beside the plug - with your motherboard it is most likely plugged into CHA_FAN1 below and to the left of the CPU cooler - but might possibly be in CHA_FAN2 near the top of the motherboard to the right of the cooler. The last option which is harder to spot - is it might be directly supplied from the PSU itself via an adapter cable.

If you can see where it is, we might be able to have you try an alternate source and see if it runs OK from there.....
 
T

Tomgar24

Member
NoddyPilot said:
It's most likely a fan issue then I imagine.

However - those extra fans are three pin 12 Volt DC fans - they can be controlled by varying the DC voltage to vary the speed. With 12 Volts they run at full speed, but they normally need at least 7 Volts supplied to get started from a standstill in the first place - and then once they are running they can keep going with a lower voltage than that. Sometimes, if the fan header they are plugged into isn't fully configured correctly, on startup it doesn't give enough voltage to get the fan turning, but if you give them a spin by hand they spin up and continue going.

Now, there is no reason to believe that this is the case with your fan as it worked before and you haven't changed anything, but it would be good to rule out a fan header issue. Can you trace the wires and see where the fan is plugged into? There will be a little name beside the plug - with your motherboard it is most likely plugged into CHA_FAN1 below and to the left of the CPU cooler - but might possibly be in CHA_FAN2 near the top of the motherboard to the right of the cooler. The last option which is harder to spot - is it might be directly supplied from the PSU itself via an adapter cable.

If you can see where it is, we might be able to have you try an alternate source and see if it runs OK from there.....
Click to expand...
It looks like the wire runs behind the motherboard down to the PSU, I guess that makes it harder to move? Thanks for the help btw, much appreciated.
 
NoddyPirate

NoddyPirate

Grand Master
Tomgar24 said:
It looks like the wire runs behind the motherboard down to the PSU, I guess that makes it harder to move? Thanks for the help btw, much appreciated.
Click to expand...
Yes that makes it a bit of a pain really. I not familiar with your case at all I'm afraid so I can't tell you what would be required to find where it's plugged in to the PSU supply

If it is powered directly from the PSU then I would say it is a faulty fan.

Just to be sure though - double check what is plugged into any other fan headers on the motherboard - if the faulty one is actually supplied from the PSU - they should correpond to any other fans you have - or all be clear except for the CPU fan if you have no other fans.

(Your header locations are as given above - and then additionally AIO_PUMP lives beside CHA_FAN1, the CPU Cooler Fan header lives beside CHA_FAN2 and CHA_FAN3 is at the bottom right edge of the motherboard also.)
 
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