What's happening on my iMac?  There are two choices of selected start up disks appearance without hold down option key.  On the other hand, it start up normally show apple picture when I hold option key.

There are two choices of selected start up disks:Main HD and Recovery HD, appearance without hold down option key.  On the other hand, it start up normally show apple picture when I hold option key.

Hi artdiva28
Welcome to Apple Discussions
First go to *System Preferences > Startup Disk* > select the *Mac OS X 10.5. on Macintosh HD* > click the Lock > hit the Restart button.
Then if the iMac is still having trouble starting up, insert your Install Disk and restart holding the Option key. In Startup Manager select the Install Disk and boot into it, choose your language, skip the Installer and go up on the menu bar to Utilities and open Disk Utility. In Disk Utility select your Macintosh HD and hit the Repair button. Once finished note any errors and what was repaired for future reference. Quit Disk Utility and restart once again holding the Option key boot back into the Macintosh HD and eject the Install Disk.
Also see > http://support.apple.com/kb/HT2956
Dennis

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