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CPU fan alternate power

Discuss CPU fan alternate power in the Cooling forum on Dev Shed.
CPU fan alternate power Cooling forum discussing cooling options for your CPU, video card, and other portions of your computer. Cooling is very important to the health of your computer.

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Old February 15th, 2008, 09:36 AM
qweasdzxc qweasdzxc is offline
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CPU fan alternate power
Something is wrong with the CPU fan on one of my computers because when I start up Windows XP it says "can't detect CPU fan" (it is a ~5 year old Dell Dimension PC) and I can hear that the fan is not doing anything. But, if I connect this fan to another computer it works fine. I assume something is wrong with the motherboard. Now, I heard something once that it is sometimes possible to plug your CPU fan directly into the PSU, but this doesn't seem very likely for this old Dell (it doesn't help that the case is a cluttered wire mess around the PSU area). So basically, I am wondering if it would be possible to get a cheap external source for power and somehow just plug it into that instead of having to junk this computer.
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Old March 10th, 2008, 07:33 AM
JohnFrank JohnFrank is offline
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Quote:
Originally Posted by qweasdzxc
Something is wrong with the CPU fan on one of my computers because when I start up Windows XP it says "can't detect CPU fan" (it is a ~5 year old Dell Dimension PC) and I can hear that the fan is not doing anything. But, if I connect this fan to another computer it works fine. I assume something is wrong with the motherboard. Now, I heard something once that it is sometimes possible to plug your CPU fan directly into the PSU, but this doesn't seem very likely for this old Dell (it doesn't help that the case is a cluttered wire mess around the PSU area). So basically, I am wondering if it would be possible to get a cheap external source for power and somehow just plug it into that instead of having to junk this computer.
Some motherboards have more than 1 MB fan connector but do not connect them all. You could try thst, failing that at the other extreme you can wire the fan (without speed control or MB feedback) to the PSU usually via a free HDD connector.
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