Help replaced a kext file and now I get a Prohibitory Sign and cant startup

I replaced my iovideo family.kext file trying to fix my non working dvi output. I replaced it with one from my mbp 15 because that one worked fine now I cant start up my mbp17 I get the Prohibitory Sign???

If you kept a copy of the original file, you can use the terminal to copy it back.
You should be able to boot into the Leopard DVD using the "C" on boot and get into the single user mode to do this.
If you have a TM backup, you can boot into the Leopard DVD and restore the entire OS from the backup.

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