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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
The PC's Boot Order may be Its Selected CD ROM or HDD is Not detected Otherwise hard disk Dont have OS
the bootable dish(hard disk Drive) are not shown on boot sequence
It means that the computer didn't recognise any bootable disk in the computer.
Press F2 OR Del Key, Open BIOS Check First Boot Device Priority, If you found first boot is HDD, Power Off your computer and Re-Connect HDD Power Connect and Data Cable.
Try to reconnect your hard drive if it is detecting in bios then you need to format your hard disk using diskpart
if your disk working then check the mbr boot if you dont want install new windows
and the grub in linux