1, put the all-in-one machine in a ventilated place to keep stable and smooth ventilation;
2. Upgrade the anti-virus software of the machine and carry out comprehensive anti-virus:
3. Close the startup items that are not commonly used. The method is as follows: press Win R to call the running window, enter msconfig, click OK, select the "Start" tab, cancel the program that does not need to be started, and then confirm to close the startup of this program.
4. If the fan of the machine has been running at high speed after the above operation, I suggest you try to save important files and reinstall the operating system of the machine to see if there is any improvement. If there is still no improvement after reinstalling the operating system, it is recommended that you try to contact the local Lenovo service center for dust removal.