Hello dipakpakpandey
The problem is this unit has First Gen i series processor and the unit need the Graphics Card to work.
At this point the options are clearing the CMOS. Try to remove the CMOS Battery and reboot the unit, this should make the BIOS Default.
Connect the CMOS Battery after the reboot.
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K B T 86
Although I am an HP employee, I am speaking for myself and not for HP