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My office iMac is having troubles today. Some months ago I had a problem where the the video would flicker then disappear. I suspected a video card problem because that's how the symptom appeared; broken and jittering video.
I disconnected everything from the computer, did a complete disk erase and resinstalled the OS and applications. Things seemed to have been sorted out.
I did a software upgrade and the problem is back. I don't know if it's related to the upgrade or just bad timing. I'm reinstalling the OS.
I don't think this is fixable by me.
I spent the better part of today putting an older iMac back in service in the office. This is iMac7,1 - a mid-2007 24"model with a 2.4 GHz Core 2 Duo processor. Not the fastest but should be find for web page building and testing. I have it running OS X El Capitan. This is the latest OS it can run and just gets me into the more recent MacOS features.
I built some image rectangles to compare dimensions to screen sizes.
Golden Gate Bridge - December 18, 2017
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