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When I turn on and start up, half way through the bar my screen goes black and then reappears and starts up as per usual. I have contacted support and we have reinstalled catalina but alas, it is still doing it. I'd like to know what it is doing from a security point of view otherwise my imac operates just fine. Is there a line by line method of showing the startup and seeing just where this is occurring? Please note - am not really all that tech savvy!
any help gratefully received.
thanks and regards for reading
scott
iMac 21.5″, macOS 10.15