I restarted my Compaq cq57 without saving any data and now it says no boot option available how to f

[Taurres]

I had recently restarted my Compaq cq57 and it says no bootable device found

[WAWood]

@Taurres 

A quick search on your model number shows it came with Win7 preloaded -- so this PC is several years old, right?

If that is the case with yours, it is most likely suffering from a failing hard drive.

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 -- that will look similar to the image below

3) press the Function key for testing the hard drive (usually F2) and let it run.