A friend of mine gave me an early 2008 24" iMac. He had a power surge a couple years ago during a lightning storm and it stopped working properly. Apple wouldn't fix it because he told them what happened. His homeowner insurance paid for a new one. He had that one sitting around and gave it to me. It starts up but with blue/magenta/green/black vertical bars. Once the booting process is done it tells me I need to power off and restart. If I boot into Windows it boots fine but there is no video. I am thinking that it's the video card. What I'd like to know is what is the best way to replace it? Apple will charge me and I do not know how expensive that would be. I went to a local mac shop and they said it would be $80 an hour for diagnosis and replacement and probably $200 for the video card. I looked online for replacement video cards and they're all like $600. I'm not sure which route to go. I'm not even 100% sure it's the video card. I got this as a DYI project but I don't know if I can do it or afford to do it.