On POST electricity self-checking

　　Microcomputer after circular telegram source, the system first by POST (Power On Self Test, on electricity self-checking) the procedure comes to internal each equipment to carry on the inspection. Usually the complete POST self-checking will include to CPU, the 640K basic memory, the 1M above extended memory, ROM, the motherboard, the CMOS memory, the string and the mouth, the indicator, the soft and hard tray system and the keyboard carries on the test, once finds the problem in self-checking, the system will give the prompting message or blows a whistle the warning.