How do computers start?

Answer 1

Answer

you provide input when you turn on the computer. Then the system software tells the CPU to start up certain programs and to turn on some hardware devices so that they are ready for more input from you. This whole process is called booting up.

The next step happens when you choose a program you want to use. You click on the icon or enter a command to start the program. Let's use the example of an Internet browser. Once the program has started, it is ready for your instructions. You either enter an address (called a URL, which stands for Uniform Resource Locator), or click on an address you've saved already. In either case, the computer now knows what you want it to do. The browser software then goes out to find that address, starting up other hardware devices, such as a modem, when it needs them. If it is able to find the correct address, the browser will then tell your computer to send the information from the web page over the phone wire or cable to your computer. Eventually, you see the web site you were looking for

Answer 2

When the user turns on a computer the power supply sends a signal to the system unit. The processor chip finds the ROM chip that contains the BIOS, which is firmware with the computer's startup instructions. The BIOS performs the power-on-self-test (POST) to check system components and compares the result with data in a CMOS chip. If the POST completes successfully, the BIOS searches for the files and the kernel of the OS, which manages memory and devices, and loads them into memory from storage. Finally the OS loads configuration information requests any necessary user information and displays the desktop on the screen.

Answer 3

Typical PC starts in several stages.

First, the power supply will power the processor, motherboard, disk and other devices. When these are ready (power supply is stable enough), processor will initiate short test to see if everything is ok. Other devices will test themselves too.

Then the processor will request information from bios and run the initial startup program. This performs other tests and, according to bios parameters, starts checking the disks or USB for operating system.

Lastly. the operating system is loaded and executed.

Answer 4

Press the "on" button.
This button is always signified by a circle broken by a short, vertical dash through the top part.

Answer 5

You press the power button which is typically on the front of a desktop. On a laptop it is usually above the keyboard but under the screen.