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2010 iMac boot issue - screen/GPU?

  Brucebhoy 09:52 26 Mar 2020

Hi.... I have a 10 year old iMac. When I switch it on, the grey apple screen comes on as usual, but then it goes to a red screen, then a purple screen with a yellow pattern then to black. On the black screen I can still see the spinning beach ball and the the cursor, as normal. If left for a while, it will usually try to restart. When I go into safe mode, it works, though the screen flickers a lot. I've already re-downloaded the last version of the OS which works. Any thoughts on what might be the issue? GPU? Age? I know I probably need to get a new machine, and having got 10 years out of this one, I'll likely go for another iMac, but if I can fix this and give it to my kids that'd be great!

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