IMac Display / Fans Stopped Working

So, I've read up on a lot of the other iMac issues with displays going out. However when attaching an external display still nothing shows up. But I've noticed the lower left fan is also not spinning (yes I am authorized to remove parts). So I removed the glass, and display to get inside. The hard drive spins up, but there is no chime on boot. So clearing the PRAM is almost impossible if done by sound. If done by time, not so hard. The SMC also cleared. And all connectors have been unplugged and replugged for seatability check.
If it is the Logic board that needs replaced, what's that going to cost? We do not extend warranties as we have way too many to deal with to do that. This computer was bought new in Aug 2007.
Thanks,

This question will probably never be answered so I give up. Thanks!

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    Last edited by scmurcott (2014-10-13 19:12:07)

    So I downgraded those packages and the kernel with no luck.
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