Question about Dell (Fan Only) M/N AFC0912DE, DC12V, 2.50A, D/N P2780 P2780

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Fan Races Computer Won't Start

Computer fan races and computer won't start. Disconnect fan computer will start then you can plug fan back in and everything works OK.

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The fan is drawing too much current from the motherboard causing the power supply to go into protection mode. Try replacing the fan with a new one and see this this does not fix the start up problem. You should check out your power supply and see if it really delivers enough power to power all the devices in your computer. The power supply could have weaken due to overheating and aging. Try checking the voltages with a software device like speedfan or hardware monitor and see if the voltages are intermittant or out of specs. These programs can be downloaded free from their websites. Just google them to find the websites. If they are you should replace the power supply. Hope this helps you with your problem.

Posted on May 12, 2009

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Posted on Jan 02, 2017

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When i turn on my dell dim 8400 the fan races very fast i have to power down and start back up sometimes it takes 2 or three times then starts to work but after awhile it freezes up or if i wiggle the...


Normally, when the fan gets loud and races, it means that the CPU is getting too hot. The normal fault is that the case and ventilation block on the CPU is full of dust.

Disconnect the tower and take it outside or somewhere where a bit of a mess isn't a problem. Open the tower and look inside. Is it full of dust?

Using a dry soft bristle paint brush, CAREFULLY liberate any dust and fluff, if you have a hoover, brush to the hoover to remove dust.

The CPU is under a big metal blob with a fan on the top, Underneath the fan there are a load of ventilation duct in a metal block. See if you can clean them out, compressed air in a can is a good way. In conjunction with the brush.

Check all the vents and fans are clear of dust, including the PSU.

Once done, try it again, does it still race / lockup / close down.

If so, then you may need to renew the heat dispersal grease which is placed between the CPU and the Heat sink (Vented metal block under the fan).

The best place to find how to do that is look on Youtube for CPU changing / fitting / upgrading.

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It is normal to have that but you should try checking if there is a dust on the fan of your computer or try checking on wjat application are you running that makes your computer seems to be racing.

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