Power Supply switch on CPU Fan

bbbearrr · 15 Feb 2013 at 08:55

Hi Guys,

ive inherited some scraps from a friend and im putting them together to have as a htpc just for watching films on.

Ive put everything together in a new case but something is confusing me.

if i turn the PSU on from the switch at the back. the CPU fan revs upto 100% until i turn the computer on via the case which slows down the cpu fan to a normal slow speed.

once the computer is turned off again, via the case the cpu remains spinning at a normal speed...

Anyone with any idea why it would do this ?

Thanks

snips86x · 15 Feb 2013 at 08:57

Has the CPU fan header been connected to the motherboard?

bbbearrr · 15 Feb 2013 at 08:59

snips86x said:
Has the CPU fan header been connected to the motherboard?

yes..

snips86x · 15 Feb 2013 at 09:04

What is the spec of the machine?

bbbearrr · 15 Feb 2013 at 09:09

snips86x said:
What is the spec of the machine?

Lanparty GF9400 2 TRS micro ATX
Intel Core 2 Duo i think is around 2.5ghz
4gb DDR2 ram
Jeantech 600w psu.
500gb hdd

bbbearrr · 15 Feb 2013 at 20:27

Any ideas ?

RJC · 15 Feb 2013 at 20:31

Strange one, Some systems / PSU used to keep the fans running after the system shutdown for a few minutes to remove any residual heat. Seems your is doing something similar or the motherboard has issues!

Idleman · 15 Feb 2013 at 20:32

Is it connected to the Cpu fan header or one of the chassis fan headers?