The BIOS performs a power on self-test, when the system is turn on. This test is used to ensure that the system is functioning properly and to gather information about that the system contains when a problem is identified with the system during power on-sl-test. 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 pattern on the speaker to tell about a problem. The exact meaning of the beep codes depends on the type and version of BIOS that you have depending on the BIOS that you are using some BIOS use very simply beep codes in a pattern of verifying number of short beeps. While other may max short and long beeps. However,if you are using a PC made by a company that writes it's own BIOS, you will have to consult your owner's manual or the company's web site or other technical information for assistance. The three most popular type of BIOS are those made by American mega trend's INC, AMI, Award, Phoenix. The Phoenix Bios is famous for it's complicated beep patterns that are actually in up to four groups one or more beeps and then a pause, followed by a many as three more patterns.
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