my mac book turns on but the screen is black
My mac book turns on but the screen is black does anyone know how to fix this
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It is most likely your logic board, but you could try booting from an external source to check.
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how do you boot from an external source and is a logic board expensive to fix
you need an external hard drive or similar with a working OS on to boot from. When you turn on the computer hold alt (opt) and select the external one. However, I do think it is the logic board and logic boards are indeed very expensive to replace.
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Have you checked that the brightness is turned up? I know that sounds really stupid and you probably tried it first thing, but I once called Applecare because my Macbook Pro was booting to a black screen and they just told me to turn up the brightness. I was a certainly embarrassed that I hadn't thought to try it, but relieved that I didn't need a big repair. :D
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I know this post it old, but just to help anybody that has similiar issues. More often than not, the problem is the dc-in board not the logic board( alot cheaper to replace than a logic board). How you can tell is if some of the usb ports dont work( use a laser mouse so you can see the bottom of the mouse light up so you knows its working, or if it doesnt light up you know its not working) and if it boots fine to an external monitor.
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Did replacing the logic board fix the problem as I have the same issue.
von DJ Vijilante
DJ, artrec7 accepted QEII's answer, indicating that this answer solved his problem.
von Kyle Wiens