Boot device not found

[Prasadshubhendu]

Boot device not found  hard disk 3F0

[Lil_Boy_Blue]

Hi
First:- Turn off the computer, press and hold the PWR button for 4 seconds.

Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat

Power on your PC, press Esc (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).

It is most probable that the Hard Disk has failed and requires replacing.

If so....

This may require another PC. Find and Download your .iso from…

W8.x should activate automagically from the embedded licence key.
https://www.microsoft.com/en-us/software-download/windows8ISO

Expand/Extract/Burn the iso Image onto a DVD/USB as needed.
Microsoft’s Creator Tool will make the required DVD or USB.

Even though it has NO actual HP software/drivers included, you may be able to
XCOPY the C:\Users\* area onto a ‘large’ USB stick, via the Command Prompt.
You’ll need to try various drive letters; D:..-..Z: until it’s matched - could be G; mine’s S:
C:\>XCOPY C:\Users\* S:\ /e /i /h (then files like those 3 listed below get copied over)
C:\Users\desktop.ini
C:\Users\All Users\agent.1509128044.bdinstall.bin
C:\Users\All Users\HP Deskjet 2540 series\Help\flash\zoom.swf