Start up and fan issues

Last week, when I was adjusting permissions for a folder, I selected the wrong folder (the hard drive actually) and changed permissions to all read and write. As soon as I realize what I done wrong, after about 5 minutes, I cancelled.
It didn't seem to affect the computer the next few start ups, but a couple days later, my CS3 programs wouldn't start up due to some errors. Great. I think there's a major issue from what I did. I restarted, and then it went downhill.
1. Start up - chime ok
2. Goes into grey apple logo screen - ok
3. stays in grey apple logo screen for a long time, and after about 3 minutes - fan starts to go in turbo mode. This goes on indefinitely.
Cannot shift, cannot command S, cannot command V. No boot keys work, except that
I can do pram reset and go into open firmware though.
Since this mac is a used mac (Mac G5 - serial number G85466****), there is no start up disk that came with it. However, I have the latest OS - Mac OS Leopard 10.5.6. I cannot get it to boot from the disk, even if I press C at start up.
How can I fix this?
<Edited by Host>

Tried option - I must have missed this one, but was able to get into the OS cd this way, so I've reinstalled the OX and it seem to work now. I am running repair permissions right now, to fix anything I might have screwed up.

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