Help my computer does not recognise my hard drive

Hi All,
Yesterday I turned my computer on to find that it would not start up. I tried following advice etc about starting up in safe mode etc but no help what I have found is that he computer does not recognise the hard drive anymore so when I out the osx install disk in and run system profiler and disk utility it does not show a hard drive. I have not done anything for this to happen. Can anyone help me with this.
Thanks.
Paul

Instead of using older OS X CD/DVD install to a new drive.
Where is your backup and clone?
Buy some drives! that is a must.
Pick up a FW case, you will need it to put the old drive in, and later, so you have an external and off line drive for backups and maintenance.
A copy of TechTool Pro 4/5 and Disk Warrior (DW first).
SuperDuper to clone your drives.
Demo of Prosoft Data Rescue 3 to scan the drive once you have a system and you put the 'dead' drive in FW case.
Then do backups and preventative maintenance on a very regular basis and have at least two backup sets.
If you have been doing that, and know and have read those instructions in the past....

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Help my computer does not recognise my hard drive

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