iMac 'blinks' when logging on.

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Your Mac's Specs
iMac: 5K 27” (2020), 3.3 GHz, 32Gb RAM. iPad2, iPad mini4, iPhone 13 Mini, Apple Watch SE
Blink is the best word I can think of for this phenomenon that just started a couple of days back.

After entering my password at the login screen, my iMac briefy (very briefly) displays whatever was on the screen before I returned to the login screen, be it the desktop, Firefox window or whatever. I then get a blue screen for a second, maybe two, and then the screen displays properly the display that had just flashed up.

Does this herald a potential problem?
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Not sure if it will help or not, but try resetting the SMC. It controls many low level functions.
 

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