just installed the first Sierra update on my iMac and now it's displaying vertical yellow lines on startup and when it finally boots. Most things I've read point to a video card issue but this literally started happening 5 minutes after install. Tried resetting pram, unplugged for a couple of minutes as well. Any ideas? Thanks.
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iMac late 2009 showing yellow vertical lines after 10.12.1 update
- Thread starter Rus Shackleford
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