Fix for vertical lines and screen freeze on 2008 iMac after Yosemite upgrade?

Mavericks was running slow with iPhoto. Did the Yosemite upgrade. Vertical lines on screen before everything freezes except mouse. Mouse continues to respond but nothing else, so forced to power off. Tried a revert to Mavericks but that seemed to tick it off (made things worse). Read 3 year old threads that graphics drivers may be at fault, but not sure how to remedy that. Any ideas?

Hi wokingmac,
If you are having an issue with your iMac display not responding appropriately, I would suggest that you troubleshoot using the steps in this article -
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Thanks for using Apple Support Communities.
Best,
Brett L

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[svn:fx-4.x] 14255: Fix for ?xml and !DOCTYPE lines reversed in ASDoc DITA output

Revision: 14255
Revision: 14255
Author:   [email protected]
Date:     2010-02-18 12:39:52 -0800 (Thu, 18 Feb 2010)
Log Message:
Fix for <?xml> and <!DOCTYPE> lines reversed in ASDoc DITA output
QE notes: None.
Doc notes: None.
Bugs: SDK-25548
Reviewed By: Paul
Tests run: checkintests
Is noteworthy for integration: No
Ticket Links:
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Modified Paths:
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macbookpro2011ISU wrote:
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Fix for vertical lines and screen freeze on 2008 iMac after Yosemite upgrade?

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