Boot issues on iMac 2010 starting but not boothing

  Dane phillip 02:48 15 Mar 2018
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iMac 2017 after startup staying on apple logo with lines on screen

  Forum Editor 16:52 19 Mar 2018

Have you got a diagnostic CD?

I you do, try to run it and see what happens. I suspect a video card problem and it may not be cost-effective to fix it. Try the CD first, and let us know how it goes.

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