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CPU FAN Starts ans Stops

When I start my computer the cpu fan starts and stops in 2 or less seconds, and this is with a new PSU.

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  • Master
  • 3,400 Answers

YOU HAVE A ELECTRICAL PROBLEM.
SAMEWHERE THE WIRES ARE NOT IN CONTACT.
CAN BE A LOOSE WIRE.
CHECK THE FRONTPANNEL-CONNECTIONS.
MAKE SURE THEY ARE AT THE RIGHT PLACE AND SIT THERE
STEADY.

Posted on Feb 10, 2014

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Posted on Jan 02, 2017

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SOURCE: cpu fan starts then stops

I figured it out....... the cheap ass cpu fan went south

Posted on Jan 12, 2008

jemthy
  • 176 Answers

SOURCE: new motherboard and cpu: no post

I have encountered that kind of problem before in the AMD processor. When your turn on the switch the fan is spins and then suddenly stop. The processor is shorted or there is defective parts you need to return it to the supplier. But can you check first if the motherboard and the processor is match . Maybe the motherboard cannot carry the speed of the processor it's better to ask to the supplier or ask them to test both the processor and motherboard .

Posted on Apr 17, 2008

  • 1 Answer

SOURCE: As it is seen the CPU Fan starts and after 10

raid driver not found

Posted on Dec 28, 2009

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1 Answer

Cpu fans starts and ends in 2 seconds


Check that a 4-pin power-cable (2-by-2 layout) from the new power-supply is connected to the matching socket on the motherboard (or maybe to a high-end video card).

Feb 07, 2014 | Cars & Trucks

1 Answer

Wont start


If you're not getting a beep code then you can be almost certain the problem does not lie with any of your hardware aside from your CPU.

It is possible your CPU is overheating, in which case you can try to increase the fan speed in the CMOS setup. For further troubleshooting I recommend using isopropyl alcohol to remove the old thermal paste from the heatsink and CPU die, and apply a new, small, pea-sized dab of thermal paste to the CPU die (after which you remount and lock into place the heatsink and CPU fan).

Sometimes these startup problems are very simple, and since you said the fan slows down rather than stopping, it could simply be you have a loose connection somewhere. I'd start with the PSU cables for the motherboard and CPU, and then the fan-monitoring plugs on the motherboard.

Also, it never hurts to load the default CMOS setup, and if you have any expansion cards you'll want to reseat all of them.

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1 Answer

HP P4SD, its running good with 4 gb RAM, P4 3.0ghz, and a couple sata hd. The problem is the fan output voltage, i havent been able to read the output chassis and cpu cooler pins voltage cause i can find...


"i can find my dmm?" did you mean CAN'T?
"its clearly off", what is off?
the fans are 3 pins,2 are power, one is RPM tachometer.
"it all works fine", so you can boot and run any OS, ?

"the voltage reads +12vdc", where, at fan or PSU?
the fans run off 12vdc, they are DC motors (from outside fan)
if the fan runs slow at 12vdc the the fan is bad or is a low RPM
fan, as some are, bigger fans run slow, for less noise.!

first is the CPU fan it must run full speed, if not the CPU will overheat in seconds and ALL CPU shut them selves (by there selves) this way. so CPU fan is first. what does it do... there....?

then BIOS screens. GOT BIOS UP? and running? with, ESC key pressed>.
let me guess your symptoms
1: PC dead. will not boot.
2: BIOS dead.
3: all fans DEAD,.
4: power switch works and all PSU voltages read right, (seems not)/?
5: if the PSU power wire reads right(DMM), matching the side sticker voltages, and the CPU is dead, the MOBO is dead, or CPU is toasted.


here is a modern PSU, sticker.
see 5 to 10 power lines, see them. all must read correctly
if a fan is dead, then its dead if 12vdc is present on the fan power pins.




psu-dsqaqngzuibs2svxh2bga4t0-2-0.jpg

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1 Answer

Zalman VF2000 LED fan starts then stops right after boot


Sounds like a defective fan, something having to do with the thermal probe, it causes the fan to speed up when cpu gets hot and to slow down when the cpu is cool. I suggest returning it for another one

Feb 10, 2010 | Computers & Internet

2 Answers

Cpu fan starts then stops


Replace it and let us know if it still happens with the new one.It shut down because of overheating, I hope it didnt mess up your CPU.

Jan 06, 2008 | Biostar GEFORCE 6100-M9 Motherboard

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