My PC Fans Roar When Sometimes When I First Start My Computer For No Reason

Zintel51

Prominent
Jul 15, 2017
4
0
510
Occasionally, when I turn my PC on, after a couple seconds, the fans will ramp up to their max speed. When this first happened, I thought this was odd so checked the temps on the motherboard it shot up to the max reading 99C. That temp is impossible because it sometimes happens before I even login into Windows. It sometimes happens after a couple minutes of start up, which allows me to check the load. Sometimes the CPU is 100% but only a very short second, and other times the CPU is less than 10% but still maxing the fans. I've tried reapplying the thermal compound and making sure everything works and it does. I just don't understand why it does that. It's really obnoxious and frustrating. I can't imagine that the thermometer on the board is broken because it's accurate the rest of the time, like 40C during games and 30C while watching YouTube. Maybe it's a Windows 10 thing when it boots. I thought it was Steam at one point when it boots but I disable it on start up, and the fans still ramp up. Note that the fans only do this about 20% of the time on start ups.

I'm looking for a solution that can stop this from happening. I don't want/need the fans to ever go above 50% anyway. Please help!



Personal Computer Specs

Case
Cooler Master MasterCase 5 Pro
Processor
Intel Core i5-4690K 3.5 GHz Quad Core (Overclocked 4.3 GHz)
Corsair H100i GTX 70.7 CFM Liquid CPU Cooler
Graphics
MSI GeForce GTX 970 4GB Twin Frozr V Video Card
Motherboard
MSI Z97-GAMING 5 ATX LGA1150 Motherboard
Memory
Corsair Vengeance Pro 16GB (2 x 8GB) DDR3-1600 Memory
Storage
Samsung 850 EVO-Series 500GB 2.5" Solid State Drive
Western Digital Blue 1TB Hard Drive
Power Supply
EVGA SuperNOVA G2 650W 80+ Gold Certified Fully-Modular ATX Power Supply
Accessories
Asus BW-12B1ST/BLK/G/AS Blu-Ray/DVD/CD Writer
Gigabyte GC-WB867D-I PCI-Express x1 802.11a/b/g/n/ac Wi-Fi Adapter
6 Corsair Air Series SP120 High Performance Edition 62.7 CFM 120mm Fans (Red)
CableMod Red/Black Sleeved EVGA Cables
Peripherals
Dual Asus MX279H 27.0" 1920x1080 60Hz Monitors
Corsair Vengeance K70 Wired Gaming Keyboard
Razer DeathAdder 2013 Wired Optical Mouse
Sennheiser G4ME ZERO Black Headset
Bose Companion 2 Series III 0W 2ch Speakers
 
Solution
This was common on old Dells. Part of Intels BTX spec. was the fan test at 100% on startup. The other part of the spec. was 1 big fan. See if there is a short POST option in the BIOS, or a fan check delete option. There are fans with a delay built in to avoid this. Mine only does it after a complete power down (unplugged) but not a normal reboot with residual power at the MB. I think this throws a full BIOS check.
The blue PWM wire will send the fan to 100% any time it's open.
This was common on old Dells. Part of Intels BTX spec. was the fan test at 100% on startup. The other part of the spec. was 1 big fan. See if there is a short POST option in the BIOS, or a fan check delete option. There are fans with a delay built in to avoid this. Mine only does it after a complete power down (unplugged) but not a normal reboot with residual power at the MB. I think this throws a full BIOS check.
The blue PWM wire will send the fan to 100% any time it's open.
 
Solution