In many cases, display problems don’t return after a restart.
If you’re using an external monitor, you might have trouble with yourMac not detecting the display.
Here’s how fix that.
Lifewire / Ran Zheng
Restarting your Mac puts everything back to a known state.
Start the Mac in Safe Mode following the guide:How to Use Your Mac’s Safe Boot Option.
If you’re still experiencing the problems, you have a possible hardware issue.
Graphic issues can be as simple as strange colors, or shearing of objects.StockFinland/iStock
Jump ahead to the Hardware Issues section.
Software Issues
If the graphics problems appear to be gone, then your problem is likely software-related.
Most software manufacturers have support sites you could check.
If you dont find any help through the various software support services, try diagnosing the issue yourself.
Continue until you’re able to repeat the problem, which narrows down the software cause.
you might find instructions at:Using Apple Diagnostics to Troubleshoot Your Mac’s Hardware.
Apple has occasionally extended repair programs for specific Mac models.
This usually happens when a manufacturing defect is discovered.
Check to see if your Mac is included in those that have an acknowledged defect.
Apple lists active exchange or repair programs at the bottom of theMac Support page.
Apple offers hands-on hardware support through its Apple Stores.
