Deep sleep/wake black flash problem of normal?

Question

When my imac is coming out of a deep sleep such as an hour or more. When the screen wakes and the password screen comes on, it flashes off or black for a quick second then back to password screen. It does not do this during use or a quick sleep just coming out of a long sleep.
How do I fix this? Is this a major problem worth taking the imac to an apple specialist? Is it a hard drive failure.
Is this normal please help. Imac is a late 2012 27 inch model with fusion drive.

Answer 1

Hey there. I am having the same issue with the same computer. Sometimes my screen will stay black longer or flash multiple times as well. I have lugged it to an Apple store twice with video proof of the events happening and after multiple extensive testing the techs say they cannot find out what is causing it or reproduce the effect. For me, it does it when waking from sleep after at least 2 hours. I told them this but apparently it didn't do it in store. After much head scratching and frustration they told me they are going to replace the logic board and ram. No idea if it will work but I'd definitely contact Apple about your situation. If anything changes I'll try to post back here about it.