Normally, the CPU fan of my HP Tower PC just functions pretty 
noiselessly and only speeds up in exceptional cases. Suddenly, since 
this morning's start up, it immediately switches to high speed with an 
increased level of noise as a result.

So, what might be the problem? I opened the case and controlled if any 
amount of dust was present but that seems not to be the case.

I suppose there must be a sensor controlling the temperature. Could that 
be broken?

I am using CPUID Hardware Monitor, and I am concerned about the 
Temperature 1 value; is that normal?:

Hardware monitor	Fintek F8000
	Voltage 0	1.67 Volts [0xD1] (VIN0)
	Voltage 1	1.66 Volts [0xCF] (VIN1)
	Voltage 2	1.63 Volts [0xCC] (VIN2)



	Fan 0		4587 RPM [0x147] (FANIN0)
	Fan 1		2521 RPM [0x253] (FANIN1)

The four core temperatures however, are all around 31 degrees Celsius.

Any idea is welcome. Thanks in advance.

I am switching off for the remainder of the day though and shall be back 
tomorrow.

Thomas

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