EMac screen shivers and blacks out. HELP!!!!

i bought my emac in november of 2002 and its had the "raster shift" for a few years. it is only a few digits away from the recalled numbers. it is out of warranty and genius bar said it was a logic board problem. PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
eMac Mac OS X (10.2.x)

I brought it to the Applestore. They did the repair, and since it was under warranty, It didn't cost me anything, but they did give me an invoice which showed what it would have cost had I to pay for it.
Sorry it's been so long, I've been negligent in checking my posts.
Good Luck!

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Ta

Hey there George,
If I understand correctly you are seeing a couple graphical issues after upgrading to Yosemite. I would use these troubleshooting steps specifically from the following article, named:
Apple computers: Troubleshooting issues with video on internal or external displays
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You can reset the Mac's parameter RAM and SMC.
Reset the resolution
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Thank you for using Apple Support Communities.
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GregMayne wrote:
i figure it is the logic board. and no it has never been changed. yes i have the box, the code. i keep everything for situations just like these and somehow they still try to **** me over.
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EMac screen shivers and blacks out. HELP!!!!

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