KNOW ABOUT POST AND VARIOUS TYPES OF BIOS

1. Short for power-on self-test, the POST is a test the computer must complete to verify all hardware is working properly before starting the remainder of the boot process. If the computer passes the POST the computer will often return a single beep and if unsuccessful will create a beep code that indicates the error.

1. POST

   • The Power-On Self Test (POST) of any computer runs just after the BIOS initializes and runs a complete systems check of all hardware before continuing the boot process. By listening to the POST beeps, a seasoned computer technician can identify any issues with a machine. Unfortunately, since BIOS beep codes are not standardized, you will need to look up your specific beep codes if you do not have the codes for your system memorized.

   AMI Beep Codes

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     One to three short beeps signifies a memory error involving RAM or DRAM. This is a part of the initial boot process and is likely something to do with your system's memory, either through installation or hardware failure. Four beeps signifies a failure in your system timer, while five beeps signifies a CPU failure. Both of these errors means you will likely have to replace your system's processor. Six to 11 short beeps signify an error with hardware integrated into the motherboard and will likely mean that your motherboard needs a replacement.

   Award Beep Codes

   • The Award BIOS system is a little less complicated when compared with the AMI system of codes. One long beep and two short signifies an error with the video card. Any repeating beeps signifies an error with the system memory. Lastly, any alternating and repeating high and low beeps signifies an error with the CPU. While these error codes may seem a bit broader than their AMI counterparts, the fixes are relatively similar and require either a processor or motherboard replacement. see more on how to troubleshoot Awardbios

   IBM Beep Codes

   • Two short beeps from any IBM BIOS will produce an error message that can be read on the screen. No beeps, continuous beeps, or repetitive short beeps means there is a power supply or motherboard error. One long beep and two or three short beeps means that there is an error with the system's video adapter. Three long beeps means that there is a general keyboard error that may deal with the connection or the keyboard itself.

   Phoenix Beep Codes

   • Phoenix provides a more complex and comprehensive set of beep codes than any other BIOS manufacturer. With a Phoenix BIOS you can literally identify just about any hardware error from the beep codes alone, though you will need a reference guide to do so. Any motherboard running a Phoenix BIOS should come equipped with a reference guide for interpreting the BIOS beep codes for your system.