That's common to many POST Power On Self Test Some BIOS give option to disable Answer from digera on reddit.com
Reddit
reddit.com › r/techsupport › pc fans go crazy fast on startup
r/techsupport on Reddit: PC fans go crazy fast on startup
May 31, 2019 -
My fans (3 case fans, 2 cpu fans for watercool rad, 2 gpu fans) go insanely loud and fast on startup. It's kind of annoying and I am not sure if I should be worried about it. They go very fast for about 5-10 seconds and then are normal for the rest of the time my PC is on.
Tom's Hardware Forum
forums.tomshardware.com › home › cpus
Question - CPU fan spins so fast at startup, what it does? | Tom's Hardware Forum
May 15, 2019 - ... Some do it to blow the dust that has settled. ... The fan usually does that if it's voltage-controlled. Fans supporting PWM (headers has 4 pins) usually don't rev to max even at boot. Some systems/BIOSes try to see if fans can get to max speed during POST.
Videos
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r/pcmasterrace on Reddit: Fans ramp up to 100% on initial start ...
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01:28
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Because the power is turned on to the fan, before the BIOS loads any real time controllers that will base the speed of the fan on the temperature of the processor. This also keeps the processor from getting excessively hot if you were to try the alternative... which would be to keep the fan off until those controllers were loaded and basing the fan speed on processor temp. More of a safeguard than anything. The processor is starting to work the moment you turn the computer on, but the BIOS still needs time to load.
Here is another alternative. What if the BIOS didn't load for some reason... a stick of Ram gone bad, for example. Would you really want your processor sitting there with no fan, waiting for the BIOS to turn on the fan after it loaded the appropriate controllers? I know I wouldn't.
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Fans are made to operate at a certain speed with a certain voltage (generally 12v). When the computer starts, all fan voltages are at their default setting of 12v, which result in 100% speed. There's no programming in this - simply the act of being powered on.
Later on, either the BIOS or a software utility is able to either reducing the DC voltage or use a pulsing PWM method in order to reduce the effective fan speed.
Now, of course, motherboard makers could have altered the circuity logic so that fans start at another voltage (50%, or even off until needed), but Bon Gart hit the nail on the head: there's a potential for disaster if the BIOS fails to boot properly while the computer remains powered.
But even if they wanted to, unlike self-contained devices the motherboard have no idea what sort of fans you may have so there's no "good guesses" to be done:
- some fan models are relatively slow at 100%, while others need their voltage reduced to 50% for an equivalent result
- some fans -especially the large ones- might not even start with 50% voltage, while they can actually be slowed to do 50% after the initial "push", complicating things further.
Reddit
reddit.com › r/buildapc › pc fans spinning way too fast
r/buildapc on Reddit: PC fans spinning way too fast
February 16, 2022 -
Ok sometimes when I start my pc my fans spin really fast and it sounds like it's going to explode
Top answer 1 of 8
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Go to your BIOS and set up a less aggressive fan profile.
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Your fan curves in BIOS determine the fan speed versus temperature. So either the fan curve is set high, or your CPU is getting hot. Check your temps while it happens to determine if you need to replace the thermal paste or get a better cooler, or whether you can just slow the fans down in BIOS.
Quora
quora.com › The-fans-in-my-PC-start-spinning-fast-after-doing-simple-tasks-What-do-I-do
The fans in my PC start spinning fast after doing simple tasks. What do I do? - Quora
Fast speeds of the fans on startup can help to remove any lying dust or sediments in the GPU ... RelatedWhen ever I run my virtual box, my fans spin like crazy and they don'stop. How do I fix this? ... Sounds like you are running a laptop. I suspect that whenever the CPU has some sort of load ...
Quora
quora.com › When-you-turn-on-the-computer-and-hear-the-fan-spinning-very-fast-for-a-few-seconds-then-slow-down-to-normal-speed-what-does-this-indicate-What-could-be-the-problem-that-causes-this-behavior
When you turn on the computer and hear the fan spinning very fast for a few seconds, then slow down to normal speed, what does this indicate? What could be the problem that causes this behavior? - Quora
Answer (1 of 2): The scenario that you are describing is not considered a “problem”. It is actually normal behavior for a computer to briefly increase fan speed during the initial boot up, once booted, the fans should then return to normal idle speeds. The reason that the fans briefly increase ...
Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 3835344 › turned-on-my-laptop-and-suddenly-my-fans-start-spi
Turned on my laptop and suddenly my fans start spinning like crazy. - Microsoft Q&A
Disable unnecessary applications programs that are running from the startup to reduce the CPU load ... Boot your computer in BIOS and check for fan speed control settings. Also, Laptop Manufacturers have software that has fan speed controls, ...
Top answer 1 of 6
4
Loud fans are usually caused by dust if there is dust built up on the fan it can throw it out of balance and make it rattle. Just because you fan got loud doesn't mean you machine has any other problems than the fan.I would start by cleaning out the computer with compressed air. Clean off the fan blades and blow out the power supply and the heat sink for the cpu. Once this is done check your temps in the bios to see if your cooling good enough. then decide if you have other problem . A good cleaning often solves a lot of problems. Hope this helps
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I've had the same issue with a computer that is super clean, dust free. It was a bad video card that caused the fans to run high. I would swap out the ram stick to see if that could be the problem also. · Jim
MSI
forum-en.msi.com › home
CPU Fan at 100% Speed on Startup
MSI Global English Forum
Top answer 1 of 2
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Hi @random_user_101 , · What is the make and model number of the desktop computer or if it is a custom build the make and model number of the motherboard? · It may be that the BIOS is corrupted and it can't POST properly. · Disconnect the AC power from the computer and check if there is a button cell battery on the motherboard. · If there is gently remove it (note the orientation so that you replace it the correct way) and then press and hold the computer’s power button for 10 seconds and then release it. · Reinsert the coin cell battery , reconnect and switch on the power and then try to start the computer. · If it starts OK if may be that the battery has been depleted and needs to be replaced. · Be aware that this will restore the BIOS settings to their default value, so if you had any settings tailored for specific hardware/operating requirements you’ll have to go back into BIOS and change them back to what you had · This battery maintains the BIOS settings when the PC is powered off and when it starts to deteriorate the settings could become corrupted. · They usually have a life span of 5-7 years and are not the rechargeable type.
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To make sure that there is not a short circuit unplug everything from the motherboard, including add-in cards, but not new power supply - make sure the ATX_12V is connected as well the main ATX power connector. · video card · modems · network cards · All drives - hard drive, CD/DVD drives and floppy. · etc. take them all out. · How many RAM chips? If two try taking one out at a time. Sometimes unseating and reseating will fix a bad contact. · Also shake the case to see if there is a loose screw some where causing a short circuit. · So now you should have the monitor plugged in, the keyboard and the power supply that is it! · We are trying to eliminate possible causes of our problem. · O.K. now try turning it on. Does anything appear on the screen? Are the fans spinning? · If yes to both go into BIOS and set to defaults. · Then try adding the hard drive with Windows on it. Did it boot up? · Let me know how it goes. · In 35 years I come across maybe about 5 motherboards that had a natural death. Quite rare, well apart from some one spilling liquid on it or the like.
Tom's Hardware Forum
forums.tomshardware.com › home › graphics cards
CPU and GPU fans spin too fast at startup, is it normal? | Tom's Hardware Forum
November 8, 2016 - Systems typically do that as the hardware initialises, so it is quite normal and nothing to be concerned about. Start worrying when you don't hear them spin up during boot. ... Same here, Asus H97ME mobo, i3 4160, CPU fan spins at its max at the start up then everything is normal, my GPU doesn't ...
Reddit
reddit.com › r/pcmasterrace › cpu 1 fan spinning too fast for no understandable purpose, how can i fix it?
r/pcmasterrace on Reddit: CPU 1 Fan spinning too fast for no understandable purpose, how can I fix it?
July 15, 2021 - Cpu fan spins for a second and stops.
MMO-Champion
mmo-champion.com › forum › off-topic forums › computer
CPU fans spinning too FAST while CPU temp cool
January 16, 2020 - I think it messed with the way the fans work. Long story short I downloaded the EVGA Precision X1 software, and manually turned down the fan. Problem solved! Be careful to monitor your GPU heat now. If the fans were spinning at 90% then it's possible the GPU may be overheating.
Steam Community
steamcommunity.com › discussions › forum › 11 › 591764935569133459
CPU fan spins too fast :: Hardware and Operating Systems
March 6, 2025 - The fan of the CPU rotates at 2800 -3500 rpm if i start a program like chrome, steam or a game. Specs: amd fx 8350 gtx 960. i checked the temperature with HWINFO. Cpu is between 30-40 degree. No matter if i run a game or run the pc many hours, its always cool. Checked this on bios too, its cool.
The Windows Club
thewindowsclub.com › the windows club › general › cpu fan runs at full speed all the time
What to do when your CPU Fan runs at full speed always?
Related: Windows laptop fan keeps running constantly · The most common cause why a CPU fan would run at full speed is that its sensor is not working properly. The solution here is to replace the fan itself.
Published October 5, 2024
HP Support
h30434.www3.hp.com › t5 › Desktops-Archive-Read-Only › CPU-fan-speed-too-high-and-too-loud › td-p › 1897795
Solved: CPU fan speed too high and too loud - HP Support Community - 1897795
January 15, 2013 - Yes, there is probably either something in your operating system putting such a load on your processor that it is causing it to overheat, or the temperature sensor in the processor has gone bad and it is sending false info to the fan to spin up.
CyberPowerPC UK
support.cyberpowersystem.co.uk › hc › en-gb › articles › 360015666179-How-to-Troubleshoot-Fan-Issues
How to Troubleshoot Fan Issues – CyberPowerPC UK
July 10, 2024 - Repeat Step 4 & 5 for all the programs or applications that you want to disable from loading during startup. Restart your PC. Malware (virus, spyware, trojans, etc.,) can cause a PC fan to run constantly due to an overload on the processor (CPU), this, in turn, causes the fans to run constantly and fast.
HP Support Community
h30434.www3.hp.com › t5 › Desktop-Hardware-and-Upgrade-Questions › CPU-fan-randomly-spins-at-max-speed › td-p › 7094917
CPU fan randomly spins at max speed - HP Support Community - 7094917
April 23, 2019 - It means, the apps using the CPU more will be at the top and ones using it less will be below them. ... Turn off the power and remove the computer side panel to locate the noisy fan.
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Alright so the problem seems to be fixed, here is what I did since my last post: I called it a night and turned off my computer while I slept for 8 hours.
This morning I turned my computer on and the fans are much quite than before. They also seem to be working correctly since I can now adjust the speeds of the fan successfully. I still might have to replace them since they aren't as quite as before, and removing the stickers of all the fans, I saw that I would not be able to drop oil in them to make them smoother. I could still hear the fan slowing and speeding up slightly.
Hopefully my fans don't act up again, but if they do I will note what activities I was doing on the pc when it did.
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If your CPU fan wire has 4 wires(most likely), you would want to set your CPU Smart Fan Control to PWM. After selecting PWM, other options may become available for Silent, Full, and maybe another mode or two. Try switching to Silent, save changes, and exit the BIOS. Your fan should spin down accordingly if things are working properly.
I only have three options for the CPU Smart Fan Control, "Auto". "Voltage", and "PWM".
My CPU fan does have 4 wires. I have set the option for PWM but nothing has changed.