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Optiplex 755 Error code: 3700:011B CPU_FAN - The fan speed is incorrect This appears at boot up and forces you to select F2. How can I fix this?

Posted by Anonymous on

5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: CPU fan runs at high speed and won't boot

Check the power supply for problems.

My computer wouldn't run thru the post up, no beep codes, only the fan running on high. The power switch didn't shut the computer down, it needed to be turned off at the power supply, or unplugged.

I replaced the motherboard to no avail. Only after changing out the power supply did it work correctly.

My theory is that the power supply quit supplying power to the motherboard, but kept supplying 12 volts to the fan.

The good news is that power supplies are cheaper than motherboards and easier to replace.

Posted on Oct 24, 2009

  • 1 Answer

SOURCE: problem withe dell gx280 fan and display

I had exactly this problem on an Optiplex GX 280.
I replaced 1 stick of ram, and everything was happy.

Posted on Jun 03, 2010

kritiko
  • 107 Answers

SOURCE: Error on normal boot up,

HI ker7758 ,

You may need to apply "Thermal paste/grease " to the CPU.

You can watch this video tutorial from Youtube:
http://www.youtube.com/watch?v=o7rPqCvCt0g

There are different types of thermal grease. You don't have to buy the expensive ones. The cheapest on the market should be able to do the job.

Posted on Apr 09, 2011

Testimonial: "I found one of the hooks for my heat sink springs had broken off. I re-soldered. Will also take your advice & re-paste."

jadiazq
  • 2878 Answers

SOURCE: Dell Optiplex cannot boot

Troubleshooting guide @ lights

http://support.dell.com/support/edocs/systems/op755/en/UG/HTML/trouble.htm#wp1302403

Posted on Oct 08, 2012

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My CPU fan suddenly started revolving at maximum speed and too noisy. But PC running fine, what's the solution?


The solution ..if it runs on this speed all the time it means something is forcing it to do so ..and usually it is the dust accumulated on the heat dispenser ..You have to take a look and if it seams dirty ..remove it with care and clean it ..
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Sounds like a bad motherboard, I try resetting the bios , removing everything but the video , could be a bad power supply too (if you have one jump the wires in there as a test). you can buy those dell MBs cheap on fleabay.
Eric

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