HP ELITEBOOK 8440P fan not work with battery

[jaheem]

HP ELITEBOOK 8440P FAN NOT WORK on batttery only
but that after flashing new bios
that old locked bios work good i dont know whats the problem and How to solve it

Thank You

[MUDBOY]

similar phenomenon in below topic?
viewtopic.php?f=2&t=1737
how about try different bios rom.

[jaheem]

i try many bios some problem but old bios work fine
i dont know why :(

[MUDBOY]

what's new bios version, and old bios version?
are other bios versions working?
if it is certainly a bug on new bios, suggest just keep the old bios version.

[jaheem]

the problem the old bios locked boot only From hdd

i try many bios no luck

[jaheem]

this problem only on 2540P and 8440p i dont know why
i work on many elitebook no problem

[MUDBOY]

this problem only on 2540P and 8440p i dont know why
i work on many elitebook no problem

maybe it is a bios bug, suggest to report it to hp support service for further assistance(new bios version release).

[blue8f]

*^_^*，Can't understand,but I guess if you uses a bga cpu or others?????????????????????my english so poor.
你们的英语看不懂，直接说中文了吧，我觉得会不会是由于使用了bga等非pga的cpu造成的呀。对于2540p会不会是由于bga的cpu本身问题或者焊接工艺问题造成的呢?不懂，凑个热闹。呵呵。我曾经遇到过bga cpu引起的更改电源模式死机的情况，我首先往这上面联系。当然对于，这个情况我想风扇控制芯片，隔离电路什么的有问题可能性也有。或者最简单的先换个风扇，然后换个cpu测试，排除。不管对不对，这个贴我是打酱油的呀。敬佩M大用英文回复的精神。

[xdx]

i have this problem
i fix it using an old bios version
thanks for share this info

[LEO]

i have this problem
i fix it using an old bios version
thanks for share this info

how did you fix it? can you share the steps?
what's the old bios version?