Why Lenovo laptops make a screeching sound when turned on

It should be the sound of the alarm horn in the notebook.

It definitely has nothing to do with the microphone, the microphone is a sound input device, and it won't ring at all, how can it have anything to do with it.

In this case, the sound that the computer can produce is the built-in audio speaker or the alarm horn inside the machine.

The alarm horn is responsible for the output of the alarm sound, such as the normal "drop" sound of self-check after normal start-up, or the long alarm sound of pressing several keyboard keys at the same time. Or the alarm sound after a hardware damage is generally a combination of long and short "drops" to indicate the cause of the failure.

Note: It is recommended to call Lenovo's laptop customer service at 400-100-6000 for technical support. Or send it to your local Lenovo after-sales service for testing.

The location of the microphone on the motherboard is not in good contact or there is dust that has not been cleaned. Please go to the maintenance office to disassemble and clean up.

First, first confirm that the hardware is fine. If the speaker is fine, the sound card is fine, and if you've tested it on other machines and it's really good, then you can read on.

2. Make sure all the cables are exactly right. Then power on the speaker and turn on the volume switch.

3. Install the driver of the sound card correctly, if it is an onboard sound card, it is best to install the driver provided on the driver disk of the motherboard.

In fact, the computer does not make a sound, and many times it is because the sound card is not driven correctly. In general, after the sound card driver is installed, there will be a small speaker icon in the taskbar in the lower right corner. ）

Fourth, if you are sure that the driver is installed correctly, then take a look at the volume settings in the computer.

The specific method is to double-click the speaker icon in the taskbar, and check whether the volume is turned off to the minimum in the "Volume Control" and "Waveform" dialog box in the pop-up "Volume Control" and "Waveform".

If these two options are not available in the dialog box, click on the "Options" menu - select "Properties" - select "Volume Control" and "Waveform" in the "Show Volume Controls" and then set them correctly.

Note: Step 4 can only be set up after the driver for the sound card has been installed correctly.

When the hard disk is working, it will emit a certain sound due to the high-speed rotation of the motor and the movement of the magnetic head.

When your hard disk reads and writes frequently (power on, boot program, defragmentation, antivirus, etc.) or when you are in a relatively quiet environment, the sound of the hard disk will be slightly more obvious, and it should be more convenient to observe that the noise and the hard disk indicator are synchronized, which is a normal performance.

It is normal for the laptop's fan to produce a certain sound when it is working because of the rotation of the fan and the flow of air.

The rotation of the fan is related to the temperature of the CPU, such as the use of high ambient temperature, too many running programs or large software will cause the CPU temperature to rise, when the CPU temperature increases, the fan will rotate more frequently, and the sound will be louder.

If the sound is particularly loud, or you feel that it is abnormal, it is recommended that you go to the nearest official service center to test and confirm, because ** can not confirm the specific sound, it is better to have an engineer to test it on site.

The location of the microphone on the motherboard is not in good contact or there is dust that has not been cleaned. Please go to the maintenance office to disassemble and clean up.

Other questions can also be compared in the two forums, the idea forum.

Think Forum:

1.Optical drive, if the optical drive is rotating, the sound is the most obvious, of course, under normal circumstances, there is no disc in it, it will not turn;

2.Hard disk, as long as there is read and write, it must be running all the time, but the sound will not be very loud, especially if it is a solid state drive, it is no longer a rotating structure, it is almost silent; If it's really that loud from the hard disk, I'm afraid the problem is bigger, and the price of data is great;

3.Fan, if it is not a portable and energy-saving design notebook, the fan will continue to rotate, if it is a new machine that is still loud, it is a design problem. But now notebooks are almost all energy-saving designs, especially the energy-saving performance balance of the integrated graphics cards of the current Intel chip product lines is very good, and there will not be too much energy pressure in ordinary use.

3.Third, there are real design issues, such as whether HP died back then. Mistaken cockroach door] notebook DV2000, DV3000, is a design problem that caused the hard disk and graphics card to dissipate too poorly, and finally burned out.