Asus laptop only launches bios?

My problem is that as soon as I start the laptop only the bios comes and nothing else works.

Already tried:

- restore defaults

- bios battery out

- save & exit

Jmd has no idea what the problem might be

Asus S500C Windows 8

Hard drive probably broken.

Is it easy to replace them?

Check in the bios, whether your Fesstplatte in the boot order is listed at the top. Make sure your BIOS is operating in compatibility mode so you can boot from a GPT or MBR file format disk. Note the difference in the displayed volume label.

If no hard disk is displayed, this may be defective. But first check if the voltage supply and the data line are properly connected.