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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?

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Posted on Jan 02, 2017

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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

  • 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:

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."

  • 2878 Answers

SOURCE: Dell Optiplex cannot boot

Troubleshooting guide @ lights

Posted on Oct 08, 2012

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Go to the BIOS and see if the settings have adjustable speeds for IDLE Fan.

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Make sure that cpu fans are running normally. Go to BIOS (generally with F2 on intel motherboards), and there will be information about cpu temperature, also fan speed (in RPM). If fan speed is 0 or very low problem is in cpu fan. (connection problem might be). If cpu fan speed is normal (high value) and cpu temperature is high, I will suggest you to open your PC case (or notebook) and see whether cpu fan is dirty or not. This is very common problem. If so, clean it.

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My dell gx 270 desktop shows alert! previous fan failer. Press F1 to continue and F2 to run setup utlity. How to solve it?

The fan failure alert on your Dell, is caused by the timings. There is no bios settings, for this. You need a new fan that runs at 1400rpm or more. This will solve the problem, also a clean install solves this problem. Best to buy a new quite fan, keep the 5pin header from the old fan copy the wire colour for the pins, make sure the fan is pwm. In the worst case, you will have to change fan, and overwrite harddrive and do a clean os install. This will fix problem, other methods, like fan speed software will redduce the fan speed cook your motherboard, but will not solve the fan failure alert. Also enter bios by pressing f2 and clear log error before you install new fan and os.

Aug 18, 2011 | Dell OptiPlex GX270 PC Desktop

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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 ..
It also have several modes for the fan to run in Bios settings ..If you changed something will probably need to be changed back ..go to bios by pressing F2 on start ..and in there look for fan modes..and select the quiet mode..This will make it run smooth unless it heats too much ..
Another option is to run it with the lid open ...cause it may just not have enough cool air ..specially if you use to run it for long hours..
The fact that the fan runs its actually a good thing ..if it would not have all chances to fry the cpu ..specially if the heat sync is full of dust

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I have dell dektop pc optiplex 755 but if i turn it on the fornt shows amber and no display as well. kinldy help cos am confused

remove the cover of the computer remove the memory from the slot and wipe *** clean with a dry cloth insert them back into the slot andrestart your computer if not weorking remove the cpu fan and the prcessor from the socket replace the processor in the socket wipe clean the processor and the cpu fan paste a thin layer of heatsink solvent and replace the cpu fan to processes and fix it tightly and restart the computer

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Dell Optiplex 755 does not boot. The steady yellow light on the power switch comes ON but no other error codes on front panel. Machine powers up for few seconds with Yellow light and powers down then wait...

I work at a college and had this same error with a nice few of the Optiplex 755's. However it was due to the power supply failing, nothing with the mother board. Have you tried replacing the power supply?

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1 Answer

Optiplex gx280 won't boot and cpu fan goes faster

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.

Jul 30, 2009 | Dell Computers & Internet

3 Answers

CPU fan runs at high speed and won't boot

Change the setting in the BIOS menu. reboot your computer.. when you see the dell logo.. press F1 (or F2 if F1 doesn't work) button until you see the BIOS screen. Check for fan options and change it

Jun 20, 2009 | Dell OptiPlex GX520 PC Desktop

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