I put my macbook into target disk mode and now it won't start up in regular mode

I put my macbook into target disk mode and now it won't start up in OSX. I have used my install disk and repaired the drive. I have held down the option key to choose the system. I have tried to start in safe mode with same result. The apple screen appears, but the gear just keeps turning. I can get it back into target disk mode by connecting it by firewaire to my macbook pro. It will start up in Windows when I choose that system. What can I do to get it to start up with OSX?
Thanks for your help.

Try this from MacFixIt as well:
In the case of drive directory damage or problems with permissions, the solution is usually to use Apple's Disk Utility to repair the disk. Of course, you won't be able to perform this operation normally (simply launching the Disk Utility application, located in Applications/Utilities, and initiating a disk repair) if your system will not startup. So two options exist:
* Insert your Mac OS X 10.4.x (Tiger) media (DVD or CD) and restart the computer while holding down the "C" key. Once the computer has booted from the installation disc, select "Utilities" from the menubar and open Disk Utility. Repair the disk, then quit Disk Utility and restart your system.
* Alternatively, you can repair the disk while booted in single user mode if you do not have access to a retail Mac OS X 10.4.x (Tiger) DVD/CD. To startup in single user mode, hold down the "Command" and "S" keys simultaneously at startup. Once properly booted, type the command fsck at the prompt. Repeat these process until no errors appear.

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