POST may refer to any of the following:
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. The POST process checks computer hardware, like memory (RAM), hard drive, CD-ROM drive, keyboard, and other hardware, to make sure all are working correctly.
If all hardware pasts the POST, the computer will continue the boot up process and may generate a single beep sound as well. If POST is unsuccessful, it will generate a beep code to indicate the error encountered and the computer will not boot up. All POST errors are relating to hardware issues with one of the components within the computer.
2. When referring to a message board, a post refers to an article published on an Internet newsgroup, forum, or other bulletin board area. It is also the act of publishing such a message.