Horizontal grey bar on my M1 iMac screen
For the past 2-3 days I have been seeing a greyish bar on my M1 iMac's screen. After a few hours the grey bar starts to blink on & off, sometimes disappearing entirely but reappearing again after a 'wakeup from sleep'.
What exactly is happening here? And what can be done to fix this issue?
And yes, I did the obligatory restart/shutdown etc. but this grey bar still appears.
iMac 24″