1. It may be that the power supply is insufficient, which indirectly causes the host fan to stop running. Replace the power supply.
2, memory, graphics card, CPU fan is loose or dusty, also can appear the above situation.
3. Unplug the optical drive and hard disk cable .. Click the del key when starting, enter the bios settings, restore the motherboard settings, and don't quit. Stay in the motherboard setup interface and wait for a while to see if it will be turned off and eliminate hardware failure.