Cannot detect hard disk in linux ubuntu.?

Hi there, everything was running fine until yesterday when I started my PC and got a message “error loading operating system.”
I checked the BIOS settings and its detecting my hard disk.
I tried reinstalling windows but at the step where it asks to select the drive,there are no drives in the list.
Now I’m running Linux Ubuntu from the live CD. (I’m running it from the cd cause I cannot install it as I can’t detect my hard disk).
Can anyone tell me what can I do ? Is there any way I can do this on my own ? Any way to access and repair the hard disk from Linux ? Or any boot options or anything ?