The IBM POST beep codes are as follows:

★ 1 short beep: This indicates that the POST was normal without any exceptions.

★ 2 short beeps: This indicates there was an error and the message is displayed on the screen.

★ No beep: Indicates no power or disconnection.

★ Continuous beep: This is indicative of a power supply, motherboard or a keyboard problem.

★ One long one short beep: this is indicative of a problem with the mother / system board.

★ One long two short beeps indicates that there is a problem with the display adapter