Please help! My iMac won’t boot since re-installed snow leopard. The whole thing started with the slow issue after upgraded to EI capitan. So followed step to do Disk utility first aid and iMac wouldn’t boot then pressed command and R and went to Disk utility and select Erase and successfully re installed snow leopard. Could go back the way it used to be, but the issue coming back, iMac running slow again it kept showing the rainbow circling having hard time to function, tried to restart iMac but no longer starting up. It keeps on the white screen with apple icon and the loading circle…..turning and turning without successfully boot up. Tried safe mode no use at all….
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