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What happens to a Computer When it BOOTS UP?

1. Electricity goes from the socket to the Power Supply.
Power supply converts the alternate current into a direct current and then delivers proper voltage and electricity to other computer components.

2. Signal goes to the CPU as we call it, Processor.
CPU (Central Processing Unit) looks into BIOS (Basic Input-Output System) contained in the ROM (Read Only Memory) for the first instructions.

3. Power-On-Self-Test.
The first instruction is to run a POST. Basically, it checks if everything is in its place and working fine.
Checks the real-time clock and the computer system bus.
Checks the CMOS, where the system time and hardware info is kept.
Begins comparing the system settings with hardware.
Tests the computer memory and then the POST will test each floppy, optical and hard drive.
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