My mini dvi output port is no longer working (2007 iMac) please help!

My mini dvi output port is no longer working, can this be replaced or do I need a new motherboard? (it's a 2007 iMac, no longer under warrantee. Long story short when I was out of town someone cut my power cord on my tv I went to turn the tv on and looked at the back of the tv to see if there was any loose connections and found the cord sliced 3/4 of the way through. I must have bumped the cord and it sparked and made a loud pop noise. Well it fried the tv (which has since been fixed) but everything that was connected to it (my ps3, receiver, and my iMac) ports are all not working now... (and yes i did try new hdmi cables to see if it was just that) If this is a hardware issue what exactly is needed to fix this? A new main board? Any feedback would be great on this. I took it to apple and they said $650 to replace the motherboard... Was just wondering if this port can just be replaced or if it is a part of the main board and that does need replacing. Everything else works fine on all three things (ps3, receiver, imac) just the outputs are fried on them. Is there any other way I can do video out of my iMac other than mini dvi? I'm not paying for the repair so I don't mind having apple replace the board, but for $650... I may as well get a new iMac for $500 more...

If Apple said the motherboard is gone, that's your answer. Even if you were to find out the port isn't part of the main board, it's all connected when you're talking about a power surge/short as you described it. And yes, I'd never invest $650 in a 5 year old computer.

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