What does BIOS beep sound mean?

1.AWARD BIOS 1short beep ：System normal 2 short beep ：CMOS Error 1 long beep and 1 short beep：Memory error 1 long beep and 2 short beep：Graphic card error 1 long beep and 3 short beep ：AGP error 1 long beep and 9 short beep ：Memory Error Continuous long beep ：Memory not correctly installed Continuous short beep ：Power supply unit failed 2.AMI BIOS 1 short beep ：Memory Error 2 short beep：Memory parity check error. 3 short beep ：basic memory 64K address check error 4 short beep ：Real Time Clock malfunction . 5 short beep ：CPU error 6 short beep：Keyboard error 7 short beep ：CPU interruption error 8 short beep：Graphic card error 9 short beep ：Memory error 10 short beep ：CMOS error 11 short beep ：CPU cache memory malfunction