startup error with no bootable device found!!

[Shaan11]

 Error shown in image. And doing continue with enter, shows : no bootable device found. And also showing insert OS in hard disk !! 

I need some help, it's very urgent. 

Thank you 

[WAWood · Accepted solution]

@Shaan11 

This issue is often due to a failing drive. So, let's check that first, because if it is failing, it would need to be replaced and there is no point then in doing anything else until we confirm that.

If your PC is new enough to support UEFI, you can use these steps to test the hard drive: http://support.hp.com/us-en/document/c00439024

If not, to check the drive you have to follow these steps:
1) Press Esc key repeatedly, several times a second, while rebooting the laptop. Do NOT hold the key down, just press it over and over.
2) Eventually, you will see an HP Startup Menu
3) Press the Function key for testing the hard drive (usually F2) and let it run.

[Shaan11]

Thank you for your valuable response. I did the same process you mentioned in your answer. While pressing esc, startup menu opened. In which , I did diagnostic scan for hard drive. And guess what! No hard drive found !! So, now I guess my hard drive is crash. 

If it is crash and my Pc is not working, even then is there any other possibility to back up my data from hard drive ?? 

I would appreciate your assistance.

Thanks