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The Bios is the first thing to run in the PC when we boot the system it job is identify, test and initialize components of the system. It run the power on-self test (POST) when the system started and stablish a list of location that can be used by an operating system to boot the PC. ‘s known as Bootstrapping
The post code error
1short beet the post has successfully completed
I Tone interrupted Failure in the power supply.
Followed short tones damage in the motherboard.
1 Long tone the memory Ram is no working or do not have any installed.
1 long tone and a short fault on the motherboard or ROM 1 long and two short tone failure on video card or not have any installed One long beep and three short EGA card failure
2 long tones and a short fault in the synchronization of image
2 short tones parity error in memory
3 short tones failure in the first 64 KB of RAM 4 Tones short or defective timer counter 5 short tones processor or video card fail the test Tones failure 6 short Keyboard controller 7 Shades short virtual processor mode active AT, error exception / processor identifier 8 short tones failure writing to video RAM Error 9 short tons she sun the ROM BIOS 10 short tones mistake the CMOS
On that way is assisted by the motherboard and the CMOS or battery motherboard
The boot sector is often operating system specific, in the most operating system it’s main function is to load an execute kernel which continues startup. If there is no active position or the position bot sector is invalid the MBR May load a secondary boot loader and past control to it and the secondary boot loader will select a partition (often via user input) and load it’s boot sector that usually load the corresponding operating system kernel. Newer BIOS can use an EFI manager instead of a regular MBI boot loader some other processor have other can of boot mode.
Why it’s necessary to use ROM for BIOS and not RAM Because ROM do not require Power to retain it contains. And ROM is the first to start when you turn the PC
How do the post beep codes make troubleshooting a computer startup?
At the end of the post the beeps lets you know if something is not working correctly on your PC or if .everything is normal.
How can you recover your system from a failure BIOS UPDATE? Recovering from this condition requires the following steps. Minimum of a power supply, a speaker, and a floppy
