Having problems with your Dell (6F858) Cooling Fan ?

My Dell cooling fan now runs at a high speed and the computer will not turn on. I robbed one from an older Dell, and got a message that the (new-old) fan wasn't working, (The plug was smaller then mine)but it turned on the computer. I took it out and reinstalled my fan, but the same thing happened ... very fast spinning and it wouldn't turn on.


Answers :

1. the cooling is running fast because the board sensor is malfunctioning.
2. your old fan will not work because the sensor is not working and giving false readings that is the voltage and current reading are not correct.
3. This means that the CPU is running hot and may be damaged and is shutting down.
4. You may be required to replace the main board ( mother board)
5. If the PC is under warranty Dell will replace the mother board and quality check the PC unit for voltage fluctuations.
6. Call the manufacturer for technical assistance.
The cooling fan racing is a symptom of a No Post state in the Motherboard. The Power LED and diagnostic LED indications would be helpful in resolving your issue. If the power LED is flashing Amber, the power supply is suspect, solid Amber points to the motherboard or something connected to it. The DIAG LEDs 1234 on the front or ABCD on the back give more specific information.

Initial Impression, is motherboard failure, post the DIAG and Power LED indications for more exact diagnosis
Repair Help & Product Troubleshooting for Dell (6F858) Cooling Fan

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