Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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no video after lighting storm

so i had my imac 20" 2.ghz plug into the wall with no surge protector, when lighting hit my house and my imac flashed leaving me with no video.

after having reset the pram removing ram, running tech tool deluxe/pro and doing all the run of the mill fixes, still nothing.

however i have screen sharing set up on my macbook, so was able to use screen sharing on my macbook to use my imac, everything works fine apart from a Black screen (black not blank or dead) all usb, wifi, sound everything 100% working

when i boot i get the chime, most the time it boots with a black screen but it has also booted with a white screen a few times.

any ideas to what could be wrong? i pretty tech minded so dont hold back.

i would love to get my imac working again, so any help would be greatly appreciated,

thanks

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I've dealt with a lot of lightning hit machines and the damage can be screwy and varied. The best thing is to take it to a reputable Mac shop and get an insurance estimate on it. Usually a machine hit will develop cascading failure. That mean one thing goes after the next as the whole thing has been weakened. I've had them start popping chips off the motherboard. A repaired machine is totally undependable. First thing to do is to get your data off immediately. The usual entry points will be via the modem or ethernet. All the USB devices are damaged. The cost for repairing the machine will usually exceed the cost to replace the machine. Insurance companies are well aware of the damage caused by lightning and will put you in a new machine with a comparable original price. Just make sure your tech has done these reports before. The tech can take the old machine in trade for doing the diagnostic and report. I'm on one now that I got this way. It took me a month to figure out what was burned and get it running and it may fail at any time. My actual cost to get it running were not that high but it took a long time to even get it up and running. I was very close to replacing the motherboard. Here's the story on it: Will not see the USB ports

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Good info +

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hello. could you follow up your question?

i have the same problem. iMac starts up, chime heard, screen is black, ext. screen no signal

did you replace the video card in the end? or display panel?

I replaced the motherboard but that did not solve my problem. I don't want to buy and return the video card just to check if it works..

do you know of any way to check if the display was fried?

thanks a lot.

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Update: Replaced my video card with 2600XT, works like a charm. http://www.amazon.com/gp/product/B003CO1...

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loo will be eternally grateful.
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