Only wallpaper and mouse on screen!

hi!
I have a mac mini (not Intel based) and I made the hard disk "not access" to me and to administrator too! Then, first the applications trying to run had a "?". I could not take back the privileges on the hard disk and reboot the mac. Now mac is opening but I now have only the wallpaper and the mouse on screen! I tried to boot from installation cd but I cant!
Pressing "C" during starting up does not make the system boot from the CD! Tried the "shift" during start up too but again an empty wallpaper and a mouse I can move... What should I do?
Mac OS X (10.3.7) mac mini

yorgosx:
Glad you are able to boot.
Before attempting to re-install the OS, try this.
Select the Macintosh HD icon.
Get Info (Command + i)
Go down the list to Ownership & Permissions.
Set is as follows:
You can: Read and Write
Click on arrow to expand Details
Click padlock and authenticate
Owner: system
Access: Read & Write
Group: admin
Access: Read & Write
Others: Read only
Go to Applications > Utilities > Disk Utility.
Select your HDD (manufacturer ID) in left column and First Aid in main column.
Click Repair Disk Permissions at bottom left.
After doing this in any software was trying to run from the dock appeared a question mark!
If the question marks persist in the dock, just click and drag them off the Dock. Open the Application in the Applicationns Folder. Click and Hold on the icon in the Dock. A menu will pop up. Select Keep in Dock.
Post back with further questions or comments.
Good luck.
cornelius

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