Member Avatar for kundi13

hi got a porblem....pluged everything in all the other fans work everything lights up but the cpu fan does not spin i also tried a new cpu fan but still no luck...what could be the problem??

spec:

asus premium mobo
p4 3.2ghz 800fsb
pnny 1gh ram
250 gb maxtor hard drive.
standard floppy driver
and dvd-rw writer
g-force t6600 turbo chache 256mb

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Dani AI

Generated

Brief expert summary: this is a typical CPU‑fan‑header failure scenario rather than a power‑supply or GPU problem. has reported the fan never spins while the system otherwise powers up; earlier replies from correctly pointed toward header/connection workarounds. The checklist below adds safe, verifiable diagnostics and cautions that are useful before accepting an RMA or permanently wiring the fan to the PSU.

  • Confirm the fan itself is good by powering it from a known 12V source (a PSU Molex-to-3/4‑pin adapter or a bench supply) and listening/looking for smooth startup. If the fan runs, the motherboard header is the likely culprit.
  • With the board powered (and metalwork clear), identify the CPU_FAN header from the manual and measure DC between its 12V and ground pins with a multimeter. A steady ~12V or the expected PWM behavior indicates the header is alive; 0V or inconsistent readings point to a damaged or disabled header.
  • Try the same fan on a different fan header and observe whether BIOS reports an RPM. If a chassis header reports RPM but CPU_FAN does not, that isolates the fault to the CPU header or its circuitry.
  • Reset CMOS and load BIOS defaults; check any “smart fan”/PWM options or a CPU fan fault threshold. A firmware quirk can leave a header inactive. If available, a BIOS update (after documenting symptoms) can sometimes fix errant fan control.
  • Inspect the header area for bent pins, cracked solder joints, burnt components or a tiny SMD fuse/jumper; these are common failure points and can be repaired by a competent technician.

Cautions and practical notes: powering the fan from the PSU is an acceptable temporary workaround but document all tests before an RMA—some vendors may object to aftermarket modifications. Running a CPU without proper cooling is risky; limit powered testing time and monitor temps closely. If multiple replacement boards from the same model show the same failure, consider a different motherboard make and double‑check installation (standoffs, shorting screws, cooler wiring).

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Member Avatar for goldeagle2005

You sure you plugged it in the CFAN connector on the mobo? If all connections are right, the mobo may be at fault. You could either replace it or use one of the molex connectors from the PSU to run the fan. If you do this, you'll need to get the required converter. Also, you won't be able to monitor the fan's speed.

Member Avatar for kundi13

yes everything is connected perfectly. connecting the fan directly to the power supply will be my last resort. however i still have warrenty on it and i have sent it back and will be getting a new same replacement mobo.

ive sent the mobo back for the fourth time now aswell. not sure if this mobo is working for me. are there any other better mobos then this asus one?? :rolleyes:

Member Avatar for goldeagle2005

Well, asus makes very good mobos. Guess your luck was bad. You could go for MSI, Soltek, Gigabyte, to name a few.

Member Avatar for goldeagle2005

Well, asus makes very good mobos. Guess your luck was bad. You could go for MSI, Soltek, Gigabyte, to name a few. I'm using MSI at the moment and have absolutely no prbs with it. I've also assembled 10 PCs with MSI boards and haven't received a single complaint. So I guess you should go for an MSI board.

Member Avatar for kundi13

hmmm im looking at few msi mobos. however i shall be recieving my replacement new mobo on wed so if still no luck then i will get a refund and try for a new brand.

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