I have a fan problem.
My PC is a HP Pavilion P6314it. I had a problem with the original mobo (SATA controller problems) and I had it replaced with a ASUS M5A78L-M LE.
Everything seems fine EXCEPT the CPU fan is always spinning at high rate, from the boot onward. PC Probe II says it's spinning at 4400-4500 rpm (chassis fan at 2600-2700 rpm) and it's unbearably noisy.
In the BIOS I had two controls enabled (Cool'n'quiet and ACPI 2.0 support).
In Windows7 I activated the power saving option (notice that the problem was present even before reinstalling Win7 and when using a USB key with Ubuntu 12.04).
What should I do to have the fan spin silently as before?
wen check your cpu temps with hardware monitor. if the cpu fan was installed right on your cpu it should be sitting around 30-50c. depending on the chip and your house temp. if it running hotter then the heat sink not on right. if it is running ok temp wise check on the mb itself that you have the cpu fan plugged into the cpu fan header. some of the headers may not do temp/speed control. the last is most newer fans that slow down use 4 wires. if your fan has three wires you may want to change it out to a 4 wire fan system.