POST

- When you press the power button on your computer…to start it, the first thing that takes place is…the power supply begins to supply power to all the…different parts of your computer.…Now, the trick here is that there's really no start button.…We can turn the system on, but in order to get the brains,…the CPU cooking, there is a wire that runs from the power…supply to the CPU called power-good.…When power-good reaches a certain voltage, suddenly,…the CPU is started, and that's why your computer…doesn't have a start button, you just turn it on…and it starts.…

So, when that takes place, the first thing the CPU,…in turn does, is he begins a system called…the power-on-self-test, or POST.…In essence, the CPU goes out, all through the…motherboard and makes a big announcement saying,…"If you can hear me, check yourself out."…And all the different peripherals go through a process,…whatever that particular process that peripheral…needs to do to verify that it's in good order…and if it's in good shape, it reports back to the…