2540p fan not working

[wojtek76]

Hi,I bougth netbook hp 2540p windows 7 instaled,and have a problem with cooling fan.The fan not working on the battery ,working connected to power adapter all the time.have you any suggestions how to fix it.thx

[Huffer]

That is by design to save power. Have you tried doing something intensive like a 3D game on battery to see if you can get the fan to kick on? Does it kick on as you power up on battery? If so you are OK. 

[wojtek76]

no I've never tried with 3D

[Huffer]

Run anything intensive like defragment the hard drive

[wojtek76]

I tried and  fan not working ,very warm bottom

[Huffer]

Windows 7 or Windows 8? You are likely set to passive cooling in power management while on battery which means the laptop will do almost anything rather than kick on the fan while on battery. It will slow the processor instead. If you shift to active cooling your battery will get eaten up very fast. In short, I think your system is probably fine and messing with it does not make any sense. However, here is some more information on passive vs. active cooling:

http://social.technet.microsoft.com/Forums/en-US/af0a536c-56f5-4811-b102-87ae2af6f53c/power-managmen...

[wojtek76]

I have Windows 7 pro instaled ,the fan in power management is set as active and fan never kick on when system power up on battery.I think  system is fine . problem is with netbook

[wojtek76]

99% this is bios problem

[Huffer]

We know the fan works because you said it runs on AC power. Have you tried updating the BIOS? 

[wojtek76]

yes,and still not working