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My old 2007 A1229 17" MacBook Pro had a hard drive failire so i replaced it with a Seagate 1T SSHD. Now it will not turn on. Only the sleep light blinks 3 times, pauses and repeats. Is there something I am missing? I have an external drive with time machine but the computer won't even come on.
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Try re-seating the RAM.
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Be sure to check the cable that connects the drive to the logic board. It could have come disconnected or even torn during the hard drive replacement procedure. If I remember right, this model's cable is glued down onto the original hard drive, making it that much more difficult to remove safely. Good luck.
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Your GPU died! These machines are ticking time bombs, and yours went off. I am sorry to hear this. :-(
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How did you install the HD? Did you clone it from your old HD or just drop it in?
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0