Getting a flashing folder with a question mark when starting Imac.

I got this flashing folder with a question mark on it when starting my Imac this morning. Im running on Osx 10.6. I put it in target disc mode and connected it to my macbook pro. I opened the disc utility app on the macbook and found my imac. I "verified" it and found an error. When I clicked "repair" the disc utility app froze and crashed. When I opened it again my Imac didn't show up. I've restarted both computers several times with no luck. Whats my next step?

Hi.
Try restarting your iMac while holding down the option (alt) key until the spinng gear appears.  You should momentarily be presented with a list of startup drives to select.
Choose Macintosh HD (your normal startup disk drive) and click the right-arrow.
When your iMac boots, go to System Preferences > Startup Disk and again select your normal startup disk. Then click Restart.
I hope this is helpful.
EDIT - disconnect the machines from each other first.

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    http://support.apple.com/kb/ht1533
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