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The key here is that if the grinding sound suddenly stops on its own, make sure that the power supply fan is still spinning Usually, you can just hold your hand by the opening of the fan to feel that it’s still blowing out. If the voltage becomes excessive, it can cause damage to these components further increasing the cost of repairs. When a power supply overheats, before it completely fails, it is likely to start sounding erratic voltage to the various devices that are connected to it, such as your motherboard, add-on cards, memory, processor or hard drive. If the power supply cooling fan (usually located at the top and back of your computer) is the source of the noise, it is more annoying than it is destructive If the nose stops, however, it could mean that the grinding fan has stopped spinning all together, which will cause the power supply to overheat and fail (the most obvious symptom of this failure is that nothing will power on.) The items that could create a major issue include your power supply cooling fan, your processor cooling fan and your hard drive. If the grinding noise is constant, all of the minor items can be quickly eliminated by shutting down the computer and disconnecting the power to each item (one at a time) then restarting your system. If you are familiar with the insides of a computer, you can remove the cover (with the system turned off) and try to locate the source of the noise just by listening when you turn it on again Be sure to avoid touching any of the electronic boards so you don’t generate ElectroStatic Discharge (ESD), especially if you are on carpet. Some of the more minor items include floppy drives, CD or DVD drives or secondary case cooling fans The reason that I refer to them as minor is that if they do fail, it won’t cause permanent damage to the system or cause the system to be completely inoperable.

The actual device that is making the noise can either signal a minor issue or a major issue, so it is important that you determine the source of the noise as soon as possible. When you start to hear grinding sounds from your computer box (often referred to as the CPU), it most likely will be one of the mechanical devices inside the computer. Most of us operate our computers in an environment where we can hear the normal whirring and blowing sounds of the various fans and mechanical components that are inside of the computer. Much of the information contained herein may have changed since posting. This question was answered on April 3, 2008. There is no rhyme or reason to when the noise occurs, it just seems to go in and out on its own. My computer is making strange grinding sounds, but not all the time.