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2010년 중반기 모델 A1278 / 2.4 or 2.66 GHz Core 2 Duo 프로세서

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Does not boot after replace the HDD cable

Hi, everyone!

I was using my MBP 2010 booting from an external drive cause the HDD cable was broken, then two days ago I replaced the cable and now it doesn't boot. Everything makes noise running, but after 5sec the MPB turn off and then turn on again and continuing until I press SHIFT+CTRL+OPTION+POWER to turn it off.

I made a record: https://youtu.be/iocJlE1y-go

Can anyone help me, please?

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To start with here is a useful doc which goes over the different startup key choices: Startup key combinations for Mac

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At this point lets unplug the HD cable from the drive and see what it does. Do you here the Bong and get a flashing question mark on the folder on the screen?

Reference: About the screens you see when your Mac starts up

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I did it already and nothing happens. I also tried unplug the cable from logic board and it doesn't works.

By the way, the keys Q to O are not working, so I can't do NVRAM reset.

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Review your keyboards ribbon cable connection

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I did it, nothing happens too.

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