Disk Boot Failure Situations
Caused by a minor fault in windows or the BIOS, which can be fixed (BIOS Setup Screen comes by hitting the Del or F2 key or F10.

There is a disc may be jam in the drive
Incorrect boot sequence In BIOS
You have installed a new hard drive on your computer
May be unplugged hard drive data cable or Power Cable (internal SATA cables are not connected properly or maybe have become faulty with long uses)
Damaged disk
Corrupted system files of booting