Press F10 to save changes and exit. You can follow the question or vote as helpful, but you cannot reply to this thread. I am using windows 10. Boot into your BIOS. My cpu fan problem was a little different. This section is not written yet. What is causing this message please. Sign Up; Forums All Activity My Activity Streams This will disable the sensor and allow you to boot normally. The MB was from a used 2350 unit I bought on Ebay, when ordering from Dell said they were out of stock, and would be 4-6 weeks to fill my order!! Did so and it did. 3. I have a Windows 8.1 desk top. Figure: Common fan locations inside an HP desktop computer. Figure: Check the fan power cable connection. Fan is the original Dell unit. I press F1 then can continue to sign in and use my computer. This thread is locked. Linus Media Group is not associated with these services. If you install another brand of CPU FAN with lower revolutions speed, the system may not be able to correctly detect it.You can try to set "CPU Fan Speed Low Limit" to 200 RPM in BIOS configuration. To resolve the error, take the following steps: Press Enter to clear the message and allow the system to boot to the Windows desktop. Some devices may only have a CPU fan or only a chassis fan. C.P.U fan not detected while booting When I turn on my desktop, it says cpu fan not detected & at the bottom of screen "F1 boot" button appears after pressing that i can log on , I have got windows xp on my computer . I get the 511 cpu fan not detected and press F1, yet when the computer boots up, the fan is running. Why do I keep getting this when I turn on my desk top? ... Exit the BIOS and boot the system. PC won't start up. * "CPU Fan Speed Low Limit" appears only when you set the CPU Q-Fan Control to [DC Mode], [PWM Mode], and [Auto]. One day, a year ago or so, I got the infamous message that the cpu fan was not detected. Disabling CPU fan speed control in the BIOS. CPU Fan not Detected (900) CPU Fan is not detected or may have malfunctioned. Click EDIT to write this answer. How To Fix A CPU Fan Error! Honestly, in daily use, if your computer cannot detect the fans of the connected CPU or cannot detect the fan speed at all because you have not changed the fan settings correctly. Shut down the computer, and then inspect and clean the exterior vents to remove dust buildup by blowing air through the vent openings. It has F1:Boot. - 6786035 After a few months, I took off the side panel to watch the fan. Only the fans are working? Solved: How can I get the part information for the replacement fan? Want to join in? Make sure the fan power cables are connected firmly to the motherboard. Press F1 to boot. L. Press F10 to save changes and exit. Recently my computer has message 511-CPU Fan not detected. Thanks. VisiHow QnA. 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