the boot loader is incorrectly confugured
- 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
Couldn't find NTLDR
Missing or corrupt boot sector
Faulty hard disk Nonbootable media in a drive
The most common is when the sector signature is damaged or removed, which results in the infamous error message "Operating system not found." If the first sector is damaged, then you will just get a black screen on boot. The Master Boot Record (MBR) will only execute on boot. It is normal for a computer to function fine if its MBR is edited while the computer is active. Be very careful! A damaged MBR can be fatal to the contents of your hard disk drive (HDD); recovery may not be possible.
it can cause system instability(bsd or boot problems ) and if its done wrong it can burn ur processor
rubber seal round edge perrished or not on rite
on BIOS setup
memory
cmos
A computer does not need to have any input or output devices plugged into it at all in order to boot, as long as it is configured to not stop on missing devices; the most common "stop error" for missing devices is a keyboard, and this can typically be disabled.
It means that there is no operating system on the selected boot device, or the boot sector has been overwritten.