On why the computer squeaks when it is turned on, it is described in numerous thematic forums, however, as it often happens, they only begin to really be interested in the reasons for this behavior when it crashes. This is the psychology of man.
Prior to this, only curious users are interested in the question of why the computer squeaks when turned on. This is partly correct, especially considering the fact that squeaking from the system unit is a rather rare occurrence. But first things first.
How an electronic heart beats
Even at the time of the appearance of the first IBM-compatible computers, it became obvious to developers and users that computers just needed some mechanism that somehow signals the status of constituent units and systems - a kind of diagnostic module that reports malfunctions. To understand why it is needed, we consider two situations, in the first of which the computer is equipped with the mentioned mechanism, and in the second not.
So, the user presses the power button, the fans begin to spin, the hard drive spins up - at first glance, no problem. However, it doesn’t get to loading the operating system: several beeps are heard (squeaks of the speaker-speaker), and the screen remains dark. Since the sounds are repeated, then, having determined the alternation of short and long, it is possible to find out from the corresponding table why the computer beeps when turned on and what needs to be done to restore its performance. Suppose that one long and two short signals alternate. This indicates a malfunction of the video subsystem. Therefore, the reason is not in the monitor, as one might think, but, most likely, in a
discrete graphics card. So you need to check it out. Quite often, such a failure is caused by a banal violation of the contacts in the connector and is easily eliminated by removing the video adapter and reconnecting.
But if the computer does not beep when you turn on, then in the end the user will receive a
system unit with a dark monitor that is noisy with cooling fans. To determine the cause of such a failure, it is necessary to alternately replace the key components with obviously good ones, naturally expecting that in this way the faulty component will be found. Obviously, not all computer owners have a warehouse with spare parts for inspection.
How is this being implemented
The mentioned diagnostic mechanism is quite simple: the BIOS firmware, when turned on, not only adjusts the operating parameters of all internal components, but also polls their status. If everything is fine, then the computer beeps when turned on once and continues to load the operating system. In addition to sound signals, LEDs on the board, an alphanumeric display, and even a voice message can be used as an indicator.
Why does the computer squeak when turned on
So, an audio signal is necessary for a general definition of a malfunction. Depending on the modification of the firmware version of BIOS, the decoding of sounds also differs. So, at Award, AMI and Phoenix they are different (the appearance of modern UEFI confused the situation even more). Recall that the system speaker must always be connected to the motherboard.