CPU FAN sensor??

[Lord Banshee]

OK i have this HP machine and when i change the fan to something quiter and larger it will not boot. It will say CPU FAN error machine will turn off in 5 sec.

How can i get around this? I looked in bios and nothing about it is there.

i am guess maybe the CPU FAN sensor looks for a certain rpm and because my fan is quiter and bigger it is probaly 1/4 the speed at max?

 

[lenjack]

your fan needs to be a 3 wire connector, and it must be connected to the cpu fan connector.

 

[Lord Banshee]

The problem is it was

The fan started and all.

 

[phonicsmonkey]

maybe theres only 2 pins going into the connector? mine has only two pins and i get that message everytime i startup too, but with my mobo i can just press f1 and it will load up

 

[Zepper]

Sometimes low rpm fans can't be detected or the alarm limit is set too high in the BIOS. To resove the low-rpm not detected it often takes a BIOS update.

And as others said, you must have a fan with a speed sensor wire that works connected to the CPU fan connector on the mobo (specially marked CPU FAN) which is not necessarily the closest one to the CPU.

.bh.

 

[Lord Banshee]

everything is in check.

The stock fan is a 3-pin fan and my new fan is a 3-pin fan. Both are in the CPU fan connecter.

I'll try a bios update if i can find one thanks and if anyone has anymore ideas that would be nice too

 

[Lord Banshee]

Ahh found it, sortof

i went to HP web site looking for bios updates and instead of find a bios update i start looking at Solve a problem page, search for "fan", and find my message.

Read though the long web site and i find a different way into the bios "F11 instead of F1" so i use it and there are more advance option like "Disable CPU Check".

Thanks for all the help guys. Uses this old machine for a simple HTPC untill i get all my parts in for a nice A64 one, so i would like to make it as quick as possible till then.