Question about Dell (5P255) Motherboard

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Microprocessor hybrid cooling fan of dell latitude C640

Cooling fan is not working... but when I check the fan itself it is good and working.. what is the possible cause of this problem?

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Re: microprocessor hybrid cooling fan of dell latitude...

Is the fan on the processor? if yes,get another processor of the same type...
If it doesn't work then, introduce a working fan of the same type and make sure is well connected...

Posted on Jan 03, 2008

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Dude, Can you send me a Bootable ISO CD of Dell Asset/Service Tag BIOS Reset Tool........Please

Hello, you can download this tool here:


The official method is to contact Dell Technical Support. Dell Technical Support will request the Service Tag and Express Service Code from the bottom of the Latitude. If the current user is not the original Latitude owner, Dell will transfer the used Latitude's registration from the original owner with only the Service Tag and Express Service Code from the tag on the laptop.
  • Dell Inspiron 5100: eeprom 93lc46, password in scan code at 0x310
  • Dell Inspiron 7500: eeprom 24c164
  • Dell Inspiron 8100: eeprom 24c02
  • Dell Latitude C600: eeprom 24c02, password in scan code at 0x00, 0x10 and 0x90
  • Dell Latitude C610: eeprom 24c02, password in scan code at 0x00, 0x10, 0x80 and 0x90
  • Dell Latitude C640: eeprom 24c04, password in scan code at 0x100 and 0x180
  • Dell Latitude CPI: eeprom 24c02, password in scan code at 0x00, 0x10, 0x80
  • Dell D600: eeprom 24c04, password in scan code at 0x110
  • Dell Optiplex: Remove the PSWD jumper
  • For most Dell Dimension desktops, the steps to reset a BIOS password and clear all CMOS settings are:
    • Locate the 3-pin CMOS password reset jumper on the system board.
    • Remove the jumper plug from pins 1 and 2.
    • Place the jumper plug on pins 2 and 3 and wait approximately 5 seconds.
    • Replace the jumper plug on pins 1 and 2.

Try the backdoor password: Dell

The another method is: by Using the Motherboard Jumper: In most motherboards CMOS battery is soldered, which makes it difficult to remove the battery. In this case we use another method.
Almost all motherboards contain a jumper that can clear all CMOS settings along with the BIOS password. The location of this jumper varies depending upon the motherboard brand. You should read your motherboard manual to check its location. If you don't have the manual then look for the jumpers near the CMOS battery. Most of the manufacturer label the jumper as CLR, CLEAR, CLEAR CMOS, etc.
When you find the jumper, look carefully. There will be 3 pins and the jumper will be joining the center pin to either left or right pin. What you need to do, is remove the jumper and join the center pin to the opposite pin. e.g. if the jumper joins center pin to left pin, then remove it and join center pin to right pin. Now wait for a few seconds and then again remove the jumper and join the center pin to left pin.
Make sure to turn the PC off, and remove the battery and power cord
( if it is a laptop ) before you continue.

Here is a picture how it looks like:

The default setting is:pin 1 to 2, to clear cmos: 2 to 3.

Best of luck :-)

Feb 05, 2013 | Motherboards

1 Answer


Check your Power Supply. If the fan doesn't work then neither does your computer ( not for long anyway)

Dec 06, 2012 | Dell Latitude D520 Motherboard Intel 945GM...

1 Answer

Power light flash but laptop will not power up


you can look this page, i think you should consider buy a new battery Dell Latitude D830 , mabe this is a very short moyen.

Nov 12, 2011 | Dell Latitude D830 (HN195 - GU095 - T497J...

1 Answer

My dell GX 270 computer has amber mother board light,No display,processor fan runs,power supply fan rotates.

hi ansilesh

If the power light is steady amber - The computer is receiving
electrical power, but an internal power problem might exist.
Ensure that the microprocessor power cable is securely connected to the
system board.
it might also be a failed mainboard already since you are experiencing a blackout.

hope this helps

Feb 11, 2011 | Dell (002TR) Motherboard

1 Answer

Can fan be replaced or do we need a new power unit

Are you referring to the fan which keeps the microprocessor cool, or the case fan? It depends upon the manufacturer but you can replace the case fan. The microprocessor fan can be replaced also. It involves opening the case and releasing the the brackets which are securing the fan to the processor. To replace the case fan, it's a relatively simple process of loosening the support bolts on the fan and removing it. Unless your system is not powering up at all (no beep sound, processor fan not running, hard drive led not flashing during boot up), you shouldn't need to replace the power supply.

Jan 27, 2011 | Motherboards

1 Answer

I have a Dell Latitude C-610 and I never have seen the fan move even when the computer has been on for over an hour. The computer is very sluggish but doesn't completely lock-up, or shut itself down( as I...

If you are concerned about the CPU temperature you could try installing a temperature control utility from here

I have used a similar program designed for toshiba laptops and that one was very useful. I can't guarantee the performance of this one for Dell but it's worth a try. It should give you a reading for the CPU temperature and the ability to adjust the fan control temperatures.

Mar 24, 2010 | Dell (5P255) Motherboard

2 Answers

Dell latitude c600, battery not charging even charging sign is shown in windows (battery is ok and checked by another dell laptop) whats problem?

hi im josh in cebu phils.may i help you. friend try to check the small wire white near the batt.or check the connections if it is not shorted or disconnected. or try to replace new batt. good luck

Feb 22, 2009 | Dell C600 (002UH) Motherboard

3 Answers

Dell Latitude C540/C640

ya u can try to chnag ethose how much is the mobo on ebay for one of these also new mobo may be your best bet even fixing them still may not work for u thats 50 50 chance

Jan 22, 2008 | Motherboards

1 Answer

Ventilator of the microprocessor

Most modern motherboards include temperature sensors that can speed up or slow down the CPU fan depending on how hot the processor is. If its noisier than it was originally it could be: -inefficient cooling caused by dust accumulating in the heatsink under the fan. -could be heat buildup in the case itself causing the processor to run hot. -could just be noisier because the bearing in the CPU fan is wearing out. -Make sure the CPU fan power cable is plugged into the proper socket. If it?s not the motherboard cannot control the speed. Let us know if you have any other questions.

Jul 09, 2007 | Thermaltake Intel LGA775 1/2U Solution...

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