1 Mac boots to white screen, nothing else works.
I have a Late 2011 MBP that just boots to a blank white screen. I've tried the usual SMC and NVRAM reset, and the problem still persists. It also cannot boot into target disk mode, nor recovery mode.
I don't know if it's the GPU or something else, I'm completely lost.
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You'll first need to do a full SMC reset. Pop off the bottom cover and disconnect the battery, now with nothing connected press and hold the power button for a good 15 secs. they lets the logic board charge to be discharged. Now plug the battery back in and the MagSafe. This time when you start the system press the T key to enter into Target Disk Mode. Do you see the FireWire/Thunderbolt icons on the screen? If you do they you proved the discreet GPU has failed and SMC was stuck in a latched state which is why you couldn't get past the reset.
por Dan
I don't see the FireWire icon on the screen, it's still showing a blank white screen
por Average Old MBP User