The BIOS performs a power-on self-test (POST) when the system is turned on. This test is used to ensure that the system is functioning properly, and to gather information about what the system contains. When a problem is identified with the system during the POST, the BIOS normally shows an error message. However, in some cases the problem is detected so early in the test that the BIOS cannot even access the video card to print the message! In this case the BIOS will produce a beeping patte'rn on the speaker to tell you about the problem. The exact meaning of the beep codes depend on the type and version of BIOS that you have. Beep codes can be in several different patterns, depending on the BIOS that you a,re using.

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Some BIOSes use very simple beep codes in a pattern of varying numbers of short beeps, while others may mix short and long beeps. However if you are using a PC made by a company that write! its own BIOS, you will have to consult your owner', manual or the company's web site or other techni information for assistance. The three most popular types of BIOS are those made by American -Megatrends Inc. (AM!), Award, and Phoenix. The Phoenix BIOS is famous for its complicated beer patterns that are actually in up to four groups-om or more beeps 'and then a pause, followed by as rnam as three more patterns.