Your machine is a 2006 model and recovery mode was not invented yet.
Insert your original system installation disk. Boot holding down the C key to get to the disk. Go to the second page of the installation. The pull down menu will now be revealed. Go to Utilities > Disk Utility. See if the machine sees the disk, attempt a repair if it does. If not replace the hard drive using this guide:
Your machine is a 2006 model and recovery mode was not invented yet.
Insert your original system installation disk. Boot holding down the C key to get to the disk. Go to the second page of the installation. The pull down menu will now be revealed. Go to Utilities > Disk Utility. See if the machine sees the disk, attempt a repair if it does. If not replace the hard drive using this guide: