- May 7, 2007
I purchased a new LG 4k monitor (LG-UK650) and now there is no boot screen. I have to turn the monitor off in order for the Mac Pro (Mid 2012) to show a boot screen. The video card is an AMD Radeon HD 7950 3072 MB and I used all connections with no success. The OS is Sierra 10.12.6. Any suggestions? Is the fix in High Sierra?