Only wallpaper and mouse on screen!

yorgosx:

Welcome to Apple Discussions.

and I made the hard disk "not access" to me and to administrator too!

Can you explain this for me? What did you do to make the HDD "no access"?

Then, first the applications trying to run had a "?".

Do you mean that when you boot you get a flashing question mark (?)?

Pressing "C" during starting up does not make the system boot from the CD!

When you insert the install disk, do you hold down the "C" key until the grey apple appears?

Please post back with responses to the above to clarify your situation.

Good luck.

cornelius

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

yorgosx:

I am glad that you were able to resolve your issue. It was a bit different for me, as I have not seen one like this before. However, your helping me understand it better finally led to your successful resolution.

Please do not hesitate to post back should you have further questions. Your thoughfulness in awarding stars is deeply appreciated.

Best Wishes.

cornelius