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Question: MacBook display black after bootup

I have a 2009 MacBook. I was using safari, and the screen went black, brought me to the login screen, turned back off, and went back to the login screen, all in about 3 seconds. I logged in to my profile, and it went back again. So I decided to force reboot it, but when it was done loading, instead of going to the profile login page, the screen went black again.


I do not have an external display to test to see if there is a type of hardware issue with the graphics card, or whatever controls the screen, all I can do myself is do software work.


Any ideas as to the cause are welcome.

MacBook, macOS Sierra (10.12.4), Late 2009 Unibody MacBook

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Nov 13, 2017 2:55 PM in response to Jacob55555 In response to Jacob55555

Shut down

Disconnect all external devices

reset the smc

https://support.apple.com/en-us/HT201295


reset the NVRAM

How to reset NVRAM on your Mac - Apple Support


then boot into safe mode

https://support.apple.com/en-us/HT201262


then reboot normally with devices disconnected.

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Question marked as Helpful

Nov 13, 2017 2:55 PM in response to Jacob55555 In response to Jacob55555

Shut down

Disconnect all external devices

reset the smc

https://support.apple.com/en-us/HT201295


reset the NVRAM

How to reset NVRAM on your Mac - Apple Support


then boot into safe mode

https://support.apple.com/en-us/HT201262


then reboot normally with devices disconnected.

Nov 13, 2017 2:55 PM

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Question: MacBook display black after bootup