Computer not detecting any OS, how to manually add os entry

Hello,

My system crashed earlier today and is not working properly.

It's saying no disk found.., and not detecting the os.

I tried doing "fixboot" "fixmbr" using the OS DVD but nothing happened.

The drives contain all the data though, as i can see it using command line.

Since i can access CLI (command line interface) is there a way to add the OS entry manually to grub, etc so that the computer can find the os and load it.

I did everything else, checked the hardware and also reset BIOS settings, but nothing happened.

Please help me out guys.. i don't want to lose my OS :)

System config : Windows 7 OS 4 GB RAM, 1 TB HDD

From superuser

• burn a linux live cd or dvd from another pc or mac and boot from it, same happened for me ended in a reinstall but it fixed the prob

• 1. belongs on ser erfault, not stack overflow.

  2. when i've seen his in the past, I've simply gone into the bios, specified no disk, sVed, rrebooted, and respecified the disk, and the issue rewolved itself.