boot process – back to basics

the enclosed links described the boot process of a computer, this is the fundamental of computing. if you think thru the process when a fault happened in your computer, you can quickly identify the what is causing the fault in most cases.

https://www.tldp.org/HOWTO/Unix-and-Internet-Fundamentals-HOWTO/bootup.html

https://www.webopedia.com/DidYouKnow/Hardware_Software/BootProcess.asp