- Jul 29, 2019
Did you managed to unbrick your macbook pro 13" via mmcubu1's method? I accidentally bricked my 2015 macbook pro 15" while trying to install osx on my new 500gb evo ssd M.2 using EFI clover usb. Now it's starting up with infinite chime loop with dim grey screen. Will need to try the disconnect screen and pram reset first.mmcubu1,
I have the same issue with a macbook pro 13" And indeed if I disconnect the screen the chime only goes once in stead off indefenately.
But I tried alt+cmd+p+r to reset pram. And also crtl+alt+p+r like you typed (I suppose crtl by mistake in stead of cmd). But it made no difference until now after connection the screen back in.
Did you do something else? And how long did you keep the keycombination? because my mac makes the chime once it starts but not after reset of the pram so without the screen I cannot see when it is rebooted.
I just couldn't believe a small mistake like this could potentially ruin a person's big investment. Really loosing faith in Apple products.