Evidence: CPU FAN spins harder while holding the POWER BUTTON/SWITCH.

Yeah,

And don't stop just there !

The backplate fan starts spinning faster too, probably, if my memory serves me correctly. I am not gonna repeat the test, way too dangerous.

Other fans were not connected, so it wouldn't surprise me, one bit, if everything starts spinning faster !

Definetly something that should be investigated by asus and other motherboard builders !

This could mean that holding the power button for 10 seconds to power it down ACTUALLY DAMAGES IT ! or could damage it on the long run !

BAD NEWS,

REALLY BAD NEWS.

Not gonna do that ever again.

Next time:

I simply use the back switch of the power supply.

SCREW STUPID SOFT POWER ON/OFF SHIT, I HATE IT ;)( IT S STUPID IT S DUMB IT S DANGEROUS IT S NOT UNDERSTOOOOD IT SUX.:)

Bye, Skybuck.

Also you might think it just spins faster.

No it doesn't just spin faster.

It starts spinning faster and faster and faster and faster.

That seems dangerous, bad, and not by design.

I am sure now you understand just perfectly >=D

Bye, Skybuck.

Many modern pc's have speed-controlled fans, so that they can adjust the cooling as needed and not make a lot of howling noise all of the time. They also have fans that give a "running" feedback signal. The BIOS manages the fans based on cmos settings and/or actual chip temperatures. Most such systems set the fans to max by default, often powering up full blast and throttling down later after other stuff is set up.

"Faster and faster and faster" is really just ramping up to 100% on.

My HP has redundant fans. Both are monitored for speed. If one fails, the other starts up. Whichever is in use is throttled to provide proper cooling, as needed, but low noise. The fans run full-on for a few seconds at powerup. The advantage of buying a fully-built PC is that all this stuff is designed in and the hardware and bios (redundant bios! and raid drives! and ecc memory!) take care of things.

Relax.

John

Yeah so big deal, tell me something I don't know.

I have sorta two redundant fans:

Power supply fan, and back plate fan

I think that you need to increase the size of your tinfoil hat.

Nicholas Sherlock

As some one pointed out the CPU fan and possibly the general fans & PSU fan (dependent upon age and cost of system) are controlled by the motherboard. Also as stated most systems fire up with the fans going full tilt, or at least working their way up to full tilt, then at some point the motherboard takes over and spins them down to a speed suitable for maintaining a comfortable temp.

The reason for starting full whack, might be because the control circuits responsible aren't activated at the beginning, however there is another reason. I recall reading somewhere that the CPU is running at 100%, despite doing naff all, at power on, so it will be heating up nicely, hence having the fan going full tilt initially is probably a good idea.

Tom

This is well known and observed behaviour.

What I observed was probably different.

First fans spinning at full speed and then started spinning extra faster and faster.

Bye, Skybuck.

I have a theory that variable speed computer fans are deliberately operated at full power when the computer is switched on to increase the chance of the fan starting to spin when it is a year old, clogged with dust and the cheap bearing has much more frication.

Bob

Thanks for this theory.

The CPU fan does not seem to be spinning at full speed.

It's spinning rather slowly.

This could indicate "fan control" failure, whatever is controlling the cpu fan has died.

Bios perhaps ?

Bye, Skybuck.

The best way to investigate is trying it out!

So I will give it a try now. Lets see, the power button. I am going to press it now.

One second, I see a window "shut down", 2 seconds now, 3 seconds now, and now 4 seco