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I get a fan failure message and the unit shuts down. Replaced the fan and the sa

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October 31, 2011 11:47:52 AM

Hello,
CPU fan failure message thenthe unit powers off. Changed the fan. Same message. The units back wall fan loses power and the message appears. CPU fan doesbt stop till the unit powers off.
a c 105 à CPUs
October 31, 2011 12:03:00 PM

Welcome to Tom's Hardware Forums!

Can you provide the computer specs?

Also, I like to know where the case rear fan is plugged into?
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October 31, 2011 12:19:03 PM

Hi, Thanks for taking my message. HP-M8400F,720GB, Windows Vista. The plug it on the Mother board for both fans.
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a c 105 à CPUs
October 31, 2011 12:43:28 PM

kabunzer said:
Hi, Thanks for taking my message. HP-M8400F,720GB, Windows Vista. The plug it on the Mother board for both fans.

The CPU heatsink fan must be plugged into the CPU_FAN header on the motherboard. The speed controls can be set in the BIOS. Please verify this.

Other fans such as the rear fan, front fan, side fan, top fan, etc., may be plugged into the appropriately motherboard headers OR directly to the PSU. Another option is to "daisy chain" the fans together and then plug them into the PSU.

In your situation, change the fan header into which the rear fan is plugged into. Check performance.
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October 31, 2011 1:18:06 PM

I'm on computer guy. Just not afraid to go where no regular Dad has gone. How does one adjust speed controls if the system continues to shut down. Please go slow with me.Thanks
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a c 105 à CPUs
October 31, 2011 1:52:11 PM

kabunzer said:
I'm on computer guy. Just not afraid to go where no regular Dad has gone. How does one adjust speed controls if the system continues to shut down. Please go slow with me.Thanks

Sure, no problem! Here at Tom's we help each other and learn from each other's contributions.

Here is the manual for your computer: http://bizsupport1.austin.hp.com/bc/docs/support/Suppor...

More manuals and guides here: http://h20000.www2.hp.com/bizsupport/TechSupport/Docume...

Start by downloading some or all of these and then familiarize yourself with your computer. You have a media center computer which is setup differently inside. Getting to the parts inside can be somewhat of a challenge (I replaced the motherboard on my friend's HP media center computer one time).

Here is an interesting video: http://www.youtube.com/watch?v=6knMv70frSc&feature=rela...
(Watch a few others too).
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October 31, 2011 2:20:40 PM

Thanks. I really should use spell check more often.
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a c 105 à CPUs
October 31, 2011 2:53:34 PM

kabunzer said:
Thanks. I really should use spell check more often.

:) 
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