When starting the computer system, a 'disk boot failure - insert system disk' error can occur for several reasons, including either hardware or software changes. It may also occur if there is a CD or a diskette in the drive while starting the computer. An incorrect boot sequence, a newly installed hard drive, an unplugged hard drive or a damaged disk may result in the the disk boot failure insert system disk error. It is possible to fix the disk boot failure error by restoring the boot sector in the case of corrupt system files. If the disk is damaged, partitioning the disk and reinstalling the operating system will solve the problem.
If you see the error message "DISK BOOT FAILURE INSERT SYSTEM DISK AND PRESS ENTER", "No system disk", it means the computer could not find the operating system and therefore could not boot.
Below are some possible causes and solutions:
A disc is stuck in the drive
Check to see if this is the case - if so, remove the disc(s) and try again
The boot sequence is incorrect
Enter the BIOS setup of your computer and edit the boot sequence so that the computer starts primarily on drive C.
A new hard drive was installed
If a new hard drive has been installed, this message is quite normal. Insert the installation CD for the operating system you wish to use and then restart the machine, having made sure the CD-ROM is defined in the BIOS setup as first in the boot sequence.
The hard drive is unplugged
Open the system unit and check the power cable of the hard drive is properly connected.
Corrupted system files
It may be that some system files needed to boot the computer have been deleted or damaged or that the boot sector of the disc is damaged.
To find out if this is the case, start the computer with a system disk or CD-ROM installation of your operating system (via the Recovery Console), and type "Dir C:" to check if the contents of the C drive are accessible. If they are accessible, the problem comes from missing or damaged files and you need to run the command: