I have an old late 2009 27" iMac with a wrecked video card. I've never bothered to fix it because it broke around the same time I got myself a new Mac Pro, but I've been thinking I'd love to use it as a second monitor. Can anyone advise me re whether or not this is doable? From what I've read online, it's generally possible to turn an iMac into a monitor using a thunderbolt cable, but I'm wondering specifically if it's possible to do it if it's got a bung video card. Thunderbolt cables are a bit pricey, so I wanted to ask here before going out and buying one. Thanks!