Fans run at 6000 rpm, CPU is cooled, but never slowdowns fan.

Hi everybody,

my A1150 is running fine except for the fans, they're always rotating with topspeed.

I tried resetting the SMC and PRAM, tried fancontrol and the like, but the results stay the same:

As soon as I turn on the machine the fans are spinning at topspeed and never slow down thus keeeping an intense noise level :-(

CPU temperature is 25 to 35 degrees C° at max, so far so good, always a 'cool' MBP.

My thoughts are: fans are ok, cooling is ok, sensors are ok, otherwise the machine wouldn't be so cold.

But what is wrong then ?

Thanks for a hint

CeeGee@gmx.de