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I've got a Dell Inspiron 1564 laptop that is about one and a half years old. Since about a week, the laptop started to overheat, causing it to switch off unexpectedly...

The cpu fan is working erratically, it can start to spin for a while, doing its job and cooling down the cpu before it stops, but then the temperature goes up, and the fan doesn't reacts, once the temperature reaches a critical point (over 85 celsius, checked with speedfan...), the laptop switches off...

I already cleaned the vents and fan from dust, to no avail, and it was actually quite clean anyway.

Drivers and bios are up-to-date, no crapware was ever installed on this machine.

I don't know how to diagnose the problem, could it be the temperature sensors that sends wrong information, so the fan doesn't reacts? but then I believe the computer wouldn't detect the overheat and stop...

Is there a way I can pin point the problem? Maybe some low-level diagnostic tools to check functionality of sensors and fans???

The warranty is already over so any suggestion would be welcome.


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up vote 1 down vote accepted

Download and make the Dell diagnostic boot media, then boot from it and run the hardware extended tests.


Dell Main page for your model


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And the diagnostic is: "Error Code 3700:011B PROCESSOR_FAN - The fan speed is incorrect." The test didn't finish though, computer stopped again :-) . Seems I'll have to find a new fan... – Smugrik Oct 20 '11 at 21:23

I also had this problem in my Inspiron 1464. I removed the RAM and inserted again. After doing this I started my computer. The fan works well then.

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