PLEASE HELP!!! My Macintosh HD volume disappeared

Ok, here's the deal...
I have a Powerbook 15" and I was trying to get it to recognize an HP printer because for some reason it didn't find the device.
So I wrote HP and they gave me some instructions wich I decided to follow (huge mistake!).
They included getting rid of some Preferences, some Caches and other things, and then to run the DISK UTILITY and do a REPAIR DISK PERMISSIONS.
I did all that but while in the Repair Disk Permissionas the computer froze for over an hour, so I performed a hard reset.
When the computer started again it didn´t find a Start up Volume.
I then started from the Tiger Installation CD, ran the Disk Utility from there...
and what is my surprise when I see that my hardrive appear but not my Macintosh HD Volume.
So...
I can´t do any repairing because the volume is not there
I can´t do a FireWire Transfer of Files because there´s no volume to connect
I can´t even Install again the System because there´s no destination volume
PLEASE SOMEBODY HELP!!!!
I´m desperate
Thanks in advance to all,
n.

Hi naxpal and welcome to Apple Discussions,
As I was reading through your post I was noticing that I also had a problem similar to that about a month ago. The only thing different is that my Macintosh HD was there (where the OS was installed), but my second partition volume disappeared. I was wondering when it happened if my data was gone for ever, but it took me a few days to figure out what to do:
1) In your case, start up from your Tiger Installation CD.
2) Open Disk Utility and look in the list on the left for Macintosh HD.
3) If it is in the list, select it, and click Mount.
4) Quit Disk Utility.
5) Restart your PowerBook G4 holding the option key.
6) If Macintosh HD is available, select it and press the arrow on the right.
7) If you got to this step, you are all set and all you have to do is eject your Tiger Installation CD.
I hope this helps you.
-Jason

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