Chosen Solution
Hi folks I had the dreaded black screen thought it was my card busted at first. However, I am getting a faded picture with the cursor showing on my external VGA monitor. I cant seem to get it onto the full screen picture and holding down shift is doing nothing etc. Anyone know if a Replacement LCD Lvds Cable 593-1352 593-1281-A 593-1028 for iMac 27" A1312 might fox this on my main one? Or any other tips? Every time I boot up I have to unplug the thunderbolt/lightning VGA adapter from the back of iMac and plug it back in to get the faded picture up. Thanks in advance for any tips Captain P. Update (12/12/2019) Hi there again Dan I did the T-target side thing, but the time its just a white screen and the cursor?
Restart your system and press and hold the T key to enter into Target Disk Mode. Do you now see on your internal display a FireWire and Lightning Icon dancing on the screen? Make sure nothing but the keyboard and mouse/trackpad are plugged in. Reference: Mac startup key combinations
