Cut the power to my iMac and now it will not complete rebooting when trying to restart

Please can anybody help me?

When this happens to me, I like to work from the outside in.  Booting in safe mode can fix issues with with certain things not loading during boot.  Resetting the SMC can fix issues like the wrong boot volume specified or a non-standard startup drive.
I like to start with booting from a USB or in your case the install DVD (I see 10.6.7 if your sig).  From the install menu you can use disk utility to check out your boot volume and repair it.
If you can describe what you see when you reboot it would help people understand how far you are getting.  Also, do you boot to a login screen or straight to the desktop?  Did the power go out while booting or while working? 

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