mac stuck on grey screen when turning on
Hello,
I have an old iMac 2007 with mac OS x snow leopard 10.6.8. When I start the mac it starts to be grey screen with black squares as in the picture. When I enter the safe mode the computer works well. I run all the diagnostics and tried to reinstall the snow leopard but it got stuck in the middle in this grey screen.
Can someone help me please???