The fan should not just be moving, but pushing a good amount of air. ; Once done, turn on your system and do not put the glass back on. The fans started running at high RPM shortly after I updated my Asus motherboard BIOS. Then you are going to need to locate the unit with CPU, cooler and radiator. Then the white wire fell out of the fan housing. Also there is a USB plug that goes in the other side of the pump that goes to a USB header on your motherboard. I also downgraded the BIOS firmware by updating to my previous BIOS version, but that didn't help and the CPU fan is stuck, regardless. Method 1:The simplest method to test your fan is to listen. Tried to put in those CPU fan 4 pin connector, but same error, and searching on web browser I found that I can connect the Cooler to that 4 pin AIO? It is important to react to such errors on time and in a proper manner, so that your computer will be working as long as possible without serious breakdowns. When you see the error message "CPU FAN Error" in POST, it means the system doesn't detect the FAN. Remove old thermal compound from integrated circuits and heat sinks and replace with new thermal compound. Remove old thermal compound from integrated circuits and heat sinks, and replace with new thermal compound.'' If the CPU fan is not doing it's job, you can burn out a CPU if it runs too long and hot. Or it might just be a build up of dust that is stopping the fan from starting. PC won't start at all, when I turn the power button on, only the fan works on CPU and graphic endlessly, there is not a single sound from the computer as beep, I tried changing RAM to different slots, unplug and plug in cables and so on, not sure what is wrong. I would prefer to not have to wait for the parts to be reshipped and reassembled. All fans were working normally, including the CPU fan. Confirm the system fan blades spin correctly, and the fan is not producing loud noises. I had the simular problem with my newly built PC, the fan was working properly but I've got fan error when starting computer. > I cleaned the fan and the computer case. However, sometimes when I pick it up and even shake it to test if it shuts off, it doesn't. In some cases, you may be able to … When the fan starts emitting a rattling sound, there is a good chance that the fan is about to fail. 3. Observe the fans closely to see if any of them do not spin. Join 250,000 subscribers and get a daily digest of news, geek trivia, and our feature articles. Try downloading "SpeedFan" to see what your computers temperature is at. If the computer still cannot boot up because of a CPU fan error, then your fan is completely dead. Save your changes and exit the BIOS. Error: CPU Fan is not working. Power off your computer and then remove the glass from your CPU’s chassis to expose all of the fans that are connected to the motherboard. This is going for 10 days and my blood pressure is going up and I do not find any answer. If you have run full system diagnostics from F12 and the same error is displayed then you are probably looking at a bad fan. Is the CPU Heatsink/Fan vendor stock or a Cooler ?? Also, I know you have all said that overheating probably isn't the issue, but is it normal for the CPU to be starting out at 43*C (As of my most recent boot up), and slowly rising (up to 46*C in the 3 minutes since I booted it up)? Make sure wires from the system and CPU fans are connected securely to the motherboard. Power off your computer and then remove the glass from your CPU’s chassis to expose all of the fans that are connected to the motherboard. Clean Vents and CPU Fan. I recently had a similar problem with a Compaq Desktop running Vista that had a noisy CPU fan. You May Also Like to Read :- Issue: error 2000-0511 CPU FAN error on boot It is working without CPU fan fail protection for years now. Usually, the fans would be loud and very hard to miss, however, all I hear is my HDD's fan running. ; After that, make sure that all cables of each fan are plugged in properly and that there are no loose cables. > The CPU fan is working. If a Cooler, probably fan is running pretty slow as your Temps are low. Move your computer. CPU Fan not Detected (900) CPU Fan is not detected or may have malfunctioned. As of right now, it's around 39-40. It was a problem on MB fan sensor. Had it for several months with no problems. This topic has been closed to new replies. Would be helpful to post machine specs, etc.. You could replace the fan if it has you worried. The fan can get clogged with dust and lint hence preventing it from spinning. Enables active heatsinks and fan ducts with fans, and disables passive heatsinks and fan ducts without fans . 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