The power-on self-test takes place every time a system starts. POST checks the system, but if there’s a problem, then this needs to be communicated to the user.
on a computer? … I mean sure there's an on and off button, … but the only thing the on and off button does … is provides electricity to the computer. … If you've got to think about this, … there has to be something … that says CPU start running programming. … And that's done by the CPU itself. … And as soon as that one wire gets enough voltage, … the CPU starts running. … And the first thing it's going to do, … is it's going to go talk to the BIOS and it's going to run … a little piece of BIOS known … as the Power On Self Test or POST. … Now the Power On Self Test is actually … a pretty simple program. … It kind of broadcast out throughout the motherboard … that says, … if you can hear me check yourself out. … So all of the memory controllers in your RAM … and USB controllers and hard drive controllers … and whatever you might have on your motherboard, … goes through its own internal diagnostic. … And assuming it does the diagnostic properly … and it checks itself out and everything's okay, …
- Troubleshooting firmware
- Installing a motherboard
- Basic electrical terminology
- Mounting and choosing a power supply
- Cooling your PC
- Quickly troubleshooting power supplies