Q: Monitor shows erratic colors when waking from sleep
Brand new Mac Mini, dual Dell monitors, OS 10.11.3. The monitor that is connected to the Mini with a Thunderbolt > HDMI cable, when it wakes from sleep, about half the time the monitor has changed to a purple cast covering the entire monitor. I can see the desktop but everything is colored purple. If I switch the monitor off for 10-15 seconds and turn it back on, the color scheme is usually back to normal. Doesn't happen on the other monitor that is connected with a HDMI > HDMI cable.
I only raise the issue here because my previous Mac Mini had video problems -- both monitors would randomly switch off to black screens requiring full Restart. I assumed a Mini hardware problem so bought a new Mini and now am having a monitor problem again on the new Mini. (I remember reading a couple years ago about monitor/video problems on Mac Minis.)
Question: before I conclude this is a monitor hardware problem, are there any known issues with a Thunderbolt > HDMI connection? I haven't bought and tried a new cable yet, but could that be a problem?
A graphics display card problem?
Thanks for any advice and suggestions.
Mac mini, OS X El Capitan (10.11.3), 16 gigs RAM
Posted on Mar 5, 2016 6:08 PM
