How to turn on my mac

I was installing GIMP for Mac (from official web site) and suddenly my mac freezed. I turned it off with Power Button, and when i tried to turn it on again, it was on the apple screen infinite time. I entered Verbose mode, and i've seen that the problem was: "disk0s2: media is not present" (message repeated infinite times) I tried the solution that says that I have to repair disk. I put the Mac OS X 10.6.2 install CD and I entered to disk utility in the installation program. I made a disk repair and I tried to make a permission repair, but that gives me an error with all units and Macintosh HD disappears from disc units list. I want know how to solve this problem or how to reinstall MAC OS X 10.6.2 from CD without losing my installed apps. Thanks

Welcome to Apple Discussions, Airiso.
You can re-install OS X without losing anything...
http://docs.info.apple.com/article.html?path=Mac/10.6/en/8177.html
But it does sound like you may have a bad disk. Do you have a copy of Repair Disk log?
Run repair disk again and see what comes up.
-mj

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