Vista - Can't start Windows Vista (hard drive isn't recognized?)

Hi.

Suddenly, my computer freezed (just like it has been doing for some time now).
When I restarted it, the computer asked for the Vista DVD, so that it could repair some files (I couldn't even boot into Safe Mode). I put the DVD inside the drive, and choose the "Repair your computer" option, but it reports that no Vista installation is found...

I then boot into the Rescue and Recovery environment (that is a Thinkpad suite, located in another partition of the disk) to see what's going on.
The System Information detects everything except the Hard Drive (it reports "Not Available" for the fields "Hard disk free space" and "Hard disk capacity"). I also can't see the harddisk in the option to backup the files to a pen (the pen is recognized, though).
Just to be sure, I run PC Doctor and my hard disk passes all tests.

What's going on? How can I fix this? Help.

My harddisk is: hitachi hts722020k9sa00 fde ata device

Check in BIOS and let us know if the hard drive is detected.

I think it isn't. I enter in the Startup -> Boot section. Although my hard disk name appears correctly, in the list, there's no plus (+) sign next to it...

Try and connect the hard drive onto a different port and see if it makes any difference.

How can I make that? Physically?

Yes you will need to open the computer and then remove the hard drive data cable and then connect it to a different port.

Before making the port swap, I tried using the Vista Retail DVD one more time, just to be sure.

I chose the "Repair your computer" option and selected "Next", even though, no hard drive appeared in the list. Luckily, it worked, anyway. Weird.

All is well, now. Thanks for your help.

Your Welcome. I m glad that its working now.