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511 CPU Fan Not Detected: How to Fix This Boot Error Physical damages or dusty fan can cause this problem354
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The CPU fans help to keep the computer in a cool and healthy state, dispersing heat generated by the processor and other components of the PC.
However, many Windows users have complained of getting an error message that says the 511 CPU fan not detected. It indicates the CPU fan isn’t working correctly or is not responsive to the device’s activities.
You may be interested in our guide on the best CPU Temperature Monitoring Software for Windows 11.
Why am I seeing the 511 CPU fan not detected error?The 511 CPU Fan not detected error may pop up on your computer for many reasons. It means the system can’t connect or use the 511 CPU fan. Some probable causes that may prompt the error are :
These causes may vary on different devices. Nonetheless, we’ll take you through some basic steps to fix the error and get your CPU fan running again.
What can I do if 511 CPU fan is not detected?Expert tip:
Disconnect external devices plugged into the computer.
Restart the PC in Safe Mode and check if the issue persists.
Check your PC for physical damages – You can check the outer case of the system while it is closed and open.
Replace the CPU fan – Replacing the fan with a new and functional one will help fix the issue.
If you can’t fix the issue, proceed with the solutions below:
1. Secure CPU fan connectionsUnplug the PC from its power source.
Close the apps running on your PC, then hold the power button to shut down the system and drain power.
Open the back case of the computer, then find the CPU fan and the port on the Motherboard.
Loosen the fan screws, remove the locks, and take the fan out. Wait for some minutes and plug it back into the port.
Couple the PC and restart it to check if the issue persists.
2. Clean the CPU fan and its port on the motherboardNOTE
Before attempting any cleaning process on the motherboard, we recommend you read the system manual. You can consult a professional for help because any damage to the motherboard can result in pricey repairs.
Unplug the PC from its power source, then press and hold the power button on your PC to drain any power residue.
Carefully unscrew the back casing of your PC to access the motherboard, then remove all the cables connected to it.
Get a blower, a brush, or a clean microfiber cloth to clean the dust.
Repeat the above step for the CPU fan to remove dust and dirt from the CPU Fan’s rotors and heatsink.
Reconnect all the components to the Motherboard and ensure each unit is well-seated in its port.
Power on your PC and check if the 511 CPU fan not detected error persists.
Cleaning the inner compartment of the PC removes the dirt and dust that may cause it to be stuck or grounded.
Updating the Windows OS will install new updates and fix compatibility issues that may prompt the 511 CPU not detected errors. Read about fixing Windows not connecting to update service if the error occurs on your PC.
4. Reset BIOSResetting BIOS (Basic Input/Output System) on your computer will refresh the output/input system and fix hardware errors. It’ll resolve corrupt BIOS components causing the 511 CPU not detected an error.
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