Fan is the original Dell unit. Boot into your BIOS. 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. How to Remove CPU Fan Error on Boot? CPU Fan not Detected (900) CPU Fan is not detected or may have malfunctioned. Sign Up; Forums All Activity My Activity Streams Click EDIT to write this answer. Disabling CPU fan speed control in the BIOS. After a few months, I took off the side panel to watch the fan. 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!! Press F10 to save changes and exit. Figure: Check the fan power cable connection. Figure: Common fan locations inside an HP desktop computer. This will disable the sensor and allow you to boot normally. How To Fix A CPU Fan Error! I have a Windows 8.1 desk top. 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 . My cpu fan problem was a little different. My model is Pavilion 510-p040qe I tried to search for it but not found. Only the fans are working? 3. Once on the Monitor tab, set the CPU Fan Speed from N/A (Not available) to IGNORE. ! I press F1 then can continue to sign in and use my computer. To resolve the error, take the following steps: Press Enter to clear the message and allow the system to boot to the Windows desktop. This section is not written yet. ... Exit the BIOS and boot the system. It has F1:Boot. I am using windows 10. In this case, you need to change the fan settings first. Why do I keep getting this when I turn on my desk top? Thanks. What is causing this message please. Want to join in? * "CPU Fan Speed Low Limit" appears only when you set the CPU Q-Fan Control to [DC Mode], [PWM Mode], and [Auto]. Linus Media Group is not associated with these services. Did so and it did. VisiHow QnA. PC won't start up. Shut down the computer, and then inspect and clean the exterior vents to remove dust buildup by blowing air through the vent openings. Press F1 to boot. Make sure the fan power cables are connected firmly to the motherboard. L. You can follow the question or vote as helpful, but you cannot reply to this thread. Recently my computer has message 511-CPU Fan not detected. Solved: How can I get the part information for the replacement fan? For awhile, it would boot sometimes OK, and other times require the F1. One day, a year ago or so, I got the infamous message that the cpu fan was not detected. - 6786035 I get the 511 cpu fan not detected and press F1, yet when the computer boots up, the fan is running. Press F10 to save changes and exit. 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