User profile for user: Rocioschabehorn
Rocioschabehorn Author
User level: Level 1
8 points

Black screen after pram/nvram reset

Hi people!


I was trying to reinstall the OS after delete the hardrive unit (macbook pro 2011). I've followed the steps, but after the NVRAM/PRAM reset (control + option + P + R), the latptop went to black screen, no apple logo light, no keyboard light.


It does turn on, makes the chime sound, but that's it. I can manage to get a voice giving me "directions" of what's going on (robot voice saying "menu, press shift control option to go back" etc).


I've connected the laptop to the TV, but no signal detected.


WHAT CAN I DO, PLEASE?! HELP!!!!

MacBook Pro 15″, OS X 10.11

Posted on Dec 5, 2020 9:20 PM

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User profile for user: HWTech
HWTech
User level: Level 9
69,302 points

Posted on Dec 7, 2020 8:55 AM

One more thing you can try: You can power off the laptop. When you press the power button to power it back on quickly close the lid of the laptop which may force it to use the external display.


If this doesn't work and you have a 15" or 17" model, then you may have a bad GPU which is common with those models. You can try forcing the laptop to use the Intel GPU instead of the discrete GPU by using the instructions in this article:

http://dosdude1.com/gpudisable/


If you could boot the laptop either normally or into Safe Mode you could use the gfxCardStatus app to force the laptop to use the Intel GPU:

https://github.com/steveschow/gfxCardStatus/releases

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User profile for user: HWTech
HWTech
User level: Level 9
69,302 points

Dec 7, 2020 8:55 AM in response to Rocioschabehorn

One more thing you can try: You can power off the laptop. When you press the power button to power it back on quickly close the lid of the laptop which may force it to use the external display.


If this doesn't work and you have a 15" or 17" model, then you may have a bad GPU which is common with those models. You can try forcing the laptop to use the Intel GPU instead of the discrete GPU by using the instructions in this article:

http://dosdude1.com/gpudisable/


If you could boot the laptop either normally or into Safe Mode you could use the gfxCardStatus app to force the laptop to use the Intel GPU:

https://github.com/steveschow/gfxCardStatus/releases

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Black screen after pram/nvram reset

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