I noticed when opening my tower up to clean out dust that one of my front case fans has stopped spinning. Page 1 of 2 - case fan LED lights wont turn on anymore - posted in Hardware, Components and Peripherals: hello geeks to go! I have 2 cables in the back. it's been a while since i've been here, a hardware problem occurred to me just an hour ago and i really need your help again, you guys have been reliable all these years. Fans that continue to spin very fast and make abnormal or loud noise might indicate a problem. I have an ASUS X570-P motherboard that supports RGB but still it wont work! If it doesn't turn freely, try WD-40, or just replace it. - try plugging one of the other fans into the motherboard's header to see if the header works. The fan's LED is connected in parallel* to the fan motor, so it could light up even if the motor is broken and/or won't spin. Question Stopped working after theme change, and won’t boot: Question Logitech C920 Stopped Working: Question AIO stopped working after fan replacement: Question Brand new PC stopped working after 2 days after minor changes, GPU not detected by Motherboard: Question Everything stopped working but PC seems fine. Try removing each fan in turn,might be a bad fan affecting the mobo fan controller/power. Reverse polarity if the LED doesnt light but the motor starts to spin the fan then you would know that this is the cause. - try spinning it by hand to check that it turns freely. Nothing. I built my computer about a month ago, and has been working flawlessly until now. Discussion Starter • #1 • Jun 17, 2011. 29 Posts . okay, this cpu has been in my keeping for a year and 3 months now. When building my PC after running it the RGB for the fans weren't working. But reversing polarity could blow the LED and smoke show of the PWM board that drives the fan motor... however the fan isnt spinning anyways so I suppose maybe just a puff of smoke from whats already not working. Common causes for fans not working, abnormal or loud fan noise, overheating: Fans or air vents that are obstructed When I had the issue yesterday the case fans stopped working and the cpu fan seemed to be locked at 10% RPM. My NZXT H440 Case fans are not working. I thought this was weird so I opened the CAM software and tried to adjust the fan speed preset. during vacation … I found today that the 4 nzxt fans in my h500i (2 base fans, 2 aer rgb fans) weren't spinning. (The CPU Cooler fan, GPU fans, and PSU fan all work!) Under normal working conditions, it is normal for a PC to generate a fair amount of heat and become warm to touch depending on usage. Red light on MOBO. I switched the plugs of the working case fan and the non-working one to verify the issue isn't in the fan … All case fans stopped. • Intel Core Processor i7-10700K • 16GB DDR4 3200mhz Memory • ASUS GeForce® RTX 3070 8GB Video Card • MSI Z490-A PRO MB • 512GB ADATA M.2 PCIe SSD - The 2nd cable is thick with 4 thick pins in the inside. Always better to take a component out of a faulty system and try it on a known working one as Pete suggests.If the PSU is what fragged the fans then adding a known working fan to that system could easily result in another non-working fan. - The first cable is thin (Leads to the Fan Hub that controls all fans) (Can't be seen, but it is the top left of the fan hub which is in the middle.) When I finally noticed the error, my case was burning hot, the cpu ran like described on 98°+ Celsius and the cores already throttled down to 3,4 GHZ. The fan is plugged into a fan controller via 3 pin connector, like the other case fans. 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