Can't access/mount hard drive, Permission denied message in Disk Utility.

Hello,
Need some help here. I was upgrading from 10.4 to 10.5. I got an error message when I tried to upgrade from the DVD. My hard drive had an exclamation mark by it and I was told I would need to erase it in order to install. When I tried quitting the installer, I had to go through startup disk to pick my Hard drive, which showed it had 10.4 installed. When I tried restarting, it would only boot off of the DVD. I checked startup disk again, but my hard drive was now not visible. I have a tower with a back-up system on it. When I picked it, it started up fine. I went under disk utility and the hard drive is listed, but is ghosted/grayed out. Repair & Verify Disk permissions are ghosted back as well.When I try to repair or verify disk, it says it can't it gives me the disk number and sector number and Permission Denied. I poked around on disk utility for info, and it looks like it doesn't have a mount point anymore and under permissions, it says that they are not enabled. So, apparently the access privileges have been erased & I don't know how to mount my disk again. I'm assuming I need some sort of commmand line in Terminal to restore my priveleges or get it to auto-mount. I do not want to erase my drive to upgrade. All my applications are on that drive. Please help!
Message was edited by: koobiak

See if Niel's User Tip can help you: I accidentally set a disk's permissions to No Access .

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