This method is the last option but the most successful one. If above methods did not work on your computer, you can rely on this.
BIOS stands for Basic Input/output system, you can access this system and find out the information about your computer using the steps given below:

• 1Close all your applications and save in case you are doing some important work. Restart your computer.
• 2As soon as your computer turn on, immediately press the F2 key or ESC key whichever your computer supports to go to the BIOS Menu.
• 3If you failed to go to the boot menu, again restart your computer and follow the above steps again.
• 4Once you get into the BIOS, you can see the full information such as model number, the product number of your computer.