● 1. Poor heat dissipation or temperature measurement failure.

The CPU has poor heat dissipation, and the common problems are that the fixing clip of the CPU radiator falls off, there is a foreign body between the CPU radiator and the CPU, and the CPU fan has been used for a long time and the radiator has accumulated too much dust. These conditions will lead to poor heat dissipation of CPU, and the accumulated temperature will automatically restart if it is too high.

In addition, the temperature probe under the CPU is damaged or the temperature circuit inside the P4 CPU is damaged, and the BIOS on the motherboard has a BUG. In some special cases, temperature measurement is not allowed, which will lead to the automatic protective restart of the host at work.

Finally, the CPU protection temperature we set in CMOS is too low, which will also lead to the automatic restart of the host.

● 2. Fan speed measurement failed.

When the speed measuring circuit of the CPU fan is damaged or the speed measuring cable is intermittently disconnected, the motherboard will mistakenly think that the fan will stop automatically shutting down or restarting because the fan speed cannot be detected, but we may see that the CPU fan rotates normally and the speed measuring is normal when checking. ● 1. Poor heat dissipation or temperature measurement failure.

3 Memory problems

If a chip on the memory stick is not completely damaged, it is likely to pass the self-test (most of them are set with POST), but it will be restarted unexpectedly because of the function failure caused by the high calorific value of the memory during operation. Many times, when the memory is damaged, the opportunity will call the police, but after the memory is damaged, there will still be faults such as no alarm and no power supply. It is best to use the elimination method, which can quickly determine the fault location.