The BIOS( basic input-output system) software is built into the PC, and is the first code run by a PC when powered on ('boot firmware'). When the PC starts up, the first job for the BIOS is the power-on self-test(POST), which initializes and identifies system devices such as the video display card, keyboard and mouse,hard disk drive, optical disc drive and other hardware. The BIOS then locates boot loader software held on a peripheral device (designated as a 'boot device'), such as a hard disk or a CD/DVD, and loads and executes that software, giving it control of the PC.[2] This process is known asbooting, or booting up, which is short for bootstrapping.
BIOS reads the MBR.
its what tell the computer what to boot first, it can be anything choosen by the bios, if you go into the bios you can change the boot order.
It could cause it to not POST at all, but neither of those sounds BIOS related.
Windows Boot Manager (bootmgr)File,Windows boot loader (winload.exe)File and the Boot Configuration Data (BCD) File
boot priority in BIOS just specifies which drive or other boot able device to use first to boot from.
The MBR takes control of the boot process from the sytem bios.
BIOS setup
BIOS is looking for a boot sector. If the disk does not have a valid boot sector at the address which is also known by the BIOS, it won't boot from disk.
POST stands for Power On Self Test. Basically, the computer checks itself for hardware and software problems. If it doesn't detect anything, it boots. If it does, it won't boot. This is useful because before boot is the only time the computer remains in the BIOS, so it is a way the computer checks the BIOS without the user having to do anything.
bios
- The computer displays an "Invalid Boot Disk" error after POST.- The computer displays a "Missing NTLDR" error after POST- The computer displays an "Invalid Boot Disk" error after POST- The computer displays a "Missing NTLDR" error after POST
BIOS