Hello
if its the CPU fan is making loud screech noises, its time to replace it
if the power supply fan is making the noise, its time to replace power supply , 5188-2859 is HP part number $25-$40
CPU fan = 5188-3722 HP part number , costs about $40-50
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The CPU fan or the fan in the switch mode power supply is faulty.
OR
The CPU fan blades is hitting some wires inside the case or the fan bearing is faulty..
Remove the cover from the desktop case and see if the CPU fan is clear of obstructions.
Check the CPU fan spins freely, if not then replace the CPU fan.
If the power supply is faulty then replace the switch mode power supply, unless you know what you are doing. Mistakes made inside this power supply can be fatal.
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