Computer Power On Self Test

Computers aren t the only devices that run a post.

Computer power on self test. A power on self test post is a succession of built in diagnostic tests performed when turning on a computer. When power is turned on post power on self test is the diagnostic testing sequence that a computer s basic input output system or starting program runs to determine if the computer keyboard random access memory disk drives and other hardware are working correctly. Some appliances medical equipment and other devices also run very similar self tests after being powered on. The system bios program starts by invoking a special program stored on a rom chip called the post power on self test.

A power on self test is a process performed by firmware or software routines immediately after a computer or other digital electronic device is powered on. The power on self test happens each time you turn your computer on. Test 1 occurs before and during the test of the video. The post has two stages.

The post is an automated test that is controlled by the bios. If the necessary hardware is detected and found to be operating properly the computer begins to boot. This article mainly deals with posts on personal computers but many other embedded systems such as those in major appliances avionics communications or medical equipment also have self test routines which are automatically invoked at power on. Random access memory ram disk drives.

Post short for power on self test is the initial set of diagnostic tests performed by the computer right after it s powered on with the intent to check for any hardware related issues. This series of tests determines proper functioning of the following. It happens during the boot process. Your computer does so much when its turned on and this is just part of that.

It sounds complicated and thats because it kind of is. Post power on self test posted by. Central processing unit cpu all other hardware devices.