Took a while to figure out why the screen stays black during boot, but I eventually found that the boot menu and apple logo are by default going to an external monitor. I have tried to fix this by resetting the default display in system preferences, SMC and PRAM resets, but to no avail. I'm at a loss as to what is causing this to happen, and can't seem to figure it out. Any help would be appreciated!
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Dragging the status bar (in Display Settings) to the screen you want as default worked for me! :)
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When your Macbook lid is open, does your Macbook monitor also work or only the external monitor? – emotality Aug 25 '15 at 19:41
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When booted, the internal display works fine, it's during the boot that the image only shows on external monitor. Cannot get into boot menu either. – TGYK Aug 25 '15 at 19:58
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Found issue to be in the display assembly. I assume something on the control board got shorted or is not functioning properly, causing EFI to not recognize the screen at boot.
