I know this is going to sound simplistic, please give a try anyway ;-)
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Zap the PRAM three times. I had the identical machine come in with a black screen last week. Tried replacing the display, nope, ldvd cable, nope, clean logic board, nope. Zapped the PRAM and there it was. The 17 2011 is the only machine I've that this fixed it.
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Zap the PRAM three times. I had the identical machine come in with a black screen last week. Tried replacing the display, nope, ldvd cable, nope, clean logic board, nope. Zapped the PRAM and there it was. The 17" 2011 is the only machine I've had, that this fixed it.
Reboot holding down the P,R, Command & Option keys let it tone three times
I know this is going to sound simplistic, please give a try anyway ;-)
Zap the PRAM three times. I had the identical machine come in with a black screen last week. Tried replacing the display, nope, ldvd cable, nope, clean logic board, nope. Zapped the PRAM and there it was. The 17 2011 is the only machine I've that this fixed it.
Reboot holding down the P,R, Command & Option keys let it tone three times
http://www.macworld.com/article/2881177/macs/how-to-reset-your-macs-nvram-pram-and-smc.html