Fans always on

[Laughing_Man]

I just discovered something odd with my fans. While performing a cleaning of my computer innards to evict the dust bunnies I shut down the computer and removed the side panel and noticed my cpu hsf was spinning. After ensuring windows was indeed shut down and not in a low power state I saw that during shut down my case, power supply, and hs fans were all indeed spinning. The case and hs fans are conected to 3 pin headers on the motherboard and the power supply fan doesn't have an external connector. No matter how I shut down the fans keep spinning at a much lower speed than when powered up. Computer is running fine and my motherboard monitor says the fans are running at 2,500(case) and 5,000(hs) rpm when on. The only way to get them to stop is the power supply's rocker switch. Anyone have any ideas?

WinXP Pro
MSI-6378
AMD Athlon XP +2600 (Thoroughbred)
400 watt generic power supply

 

[mike99]

Any keyboard lights on? If you press Caps Lock key, does the light on keyboard respond? If yes, is in Standby. If you remove mains plug from wall and they still run, it's worth a fortune!
Check BIOS power options, is set to power off, not Standby.

Mike.

 

[Laughing_Man]

No lights on keyboard. Didn't find the answer to the worlds power needs either. Stops when pulled from the plug. BIOS power settings are all set to disabled or ignore, I let windows handle the power settings.

 

[JohnnyLucky]

Check your MS Windows power management settings.

 

[Laughing_Man]

All are normal, and WOL is not active.

 

[Zenthar]

When you plug everything back in, does the fan restart right away or do you have to power the computer first?

 

[Laughing_Man]

Fans start right away.

 

[AKM880]

Then somehow your computer is still on........weird lol.

 

[apache_lives]

Powered USB Hubs can do this (along with anything USB that also has an AUX power pack) - unplug anything USB and see what happens?

 

[Onus]

This may be a "feature" of your mobo; it runs the fans at all times to cool the system down, for example after use. Some PSUs do this as well, for their internal fans. Check your mobo manual.

 

[Laughing_Man]

Everything unplugged but the mains, and the fans are on. I have heard of PSU's that do keep their fans spinning for a while after shut down, but mine stays on constantly.
Other than using a small bit of electricity and shortening the life span of my fans it may not be a problem, but I've never encountered this before. And was not sure where to start; MB, PSU, or maybe the on/off switch on the case.

 

[mamw93]

That means that there is something wrong with the PSU.