POST (Power-On-Self-Test).
When the power of a PC is turned on, POST is the diagnostic testing sequence that a computers basic input/output system runs to determine if the computer keyboard, RAM (Random Access Memory), Disk Drives, and other hardware are working correctly.
If the necessary hardware is detected and found to be operating properly, the computer begins to boot. If the hardware is not detected or is found to be operating properly, the BIOS issues an error message, which may be text on the display screen or a series of coded beeps, depending on the nature of the program.
Since POST runs before the computers video card is activated, it may not be possible to process to the display screen. The pattern of beebs may be a variable numbers of a short beeps or a mixture of long and short beeps, depending on what type of BIOS is installed. - The patterns of beeps contain messages about the nature of the problem detected. For Example: If the keyboard is not detected, a particular pattern of beeps will inform you of that fact. An error found in POST is usually fatal and will halt the boot process, since the hardware is absolutely essential for the computer functions.
No comments:
Post a Comment