MacMost Q&A Forum • View All Forum Questions • Ask a Question 1/22/108:05 am Is it a bad idea to have an iMac display at full brightness? gary im wondering if i have my iMac 27 brightness at full will it burn out my display? — colin Comments: 2 Responses to “Is it a bad idea to have an iMac display at full brightness?” Gary Rosenzweig 11 years ago Why would they let you turn it up to “full” if it did? I have a lot of old Macs around, and I’ve never seen a burnt-out display. I’ve never heard that full brightness is dangerous in any way. Did you hear otherwise? Colin 11 years ago No I was just wondering Related Video Tutorials: Multiple Screen Display Arrangement Comments Closed.