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Start by
[image|2147011]
getting a USB to SATA adapter:
https://www.amazon.com/Adapter-Cable-Converter-Drives-Solid/dp/B073SXTY64/ref=asc_df_B073SXTY64/?tag=hyprod-20&linkCode=df0&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936&psc=1&tag=&ref=&adgrpid=82240853001&hvpone=&hvptwo=&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936
Remove your internal hard drive, hook it up to the adapter and boot. This will tell you if the hard drive/IR cable needs to be replaced (using the 2012 model).
A new cable will also allow you to install an SSD 2.5” drive to get your machine running twice as fast. You will be able to boot from your old drive, format and install a system on the new drive and then use Migration Assistant your move your data.
Next hook up an external USB keyboard and see if the keys will work. Your machine may have received liquid damage and you may need to replace the keyboard. This is labor intensive but only costs about $20.
UPDATE
+https://www.ifixit.com/Store/Mac/MacBook-Pro-13-Inch-Unibody-Mid-2012-Hard-Drive-Cable/IF163-041?o=1
+
[image|2147811]

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Start by
[image|2147011]
getting a USB to SATA adapter:
https://www.amazon.com/Adapter-Cable-Converter-Drives-Solid/dp/B073SXTY64/ref=asc_df_B073SXTY64/?tag=hyprod-20&linkCode=df0&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936&psc=1&tag=&ref=&adgrpid=82240853001&hvpone=&hvptwo=&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936
Remove your internal hard drive, hook it up to the adapter and boot. This will tell you if the hard drive/IR cable needs to be replaced (using the 2012 model).
A new cable will also allow you to install an SSD 2.5” drive to get your machine running twice as fast. You will be able to boot from your old drive, format and install a system on the new drive and then use Migration Assistant your move your data.
Next hook up an external USB keyboard and see if the keys will work. Your machine may have received liquid damage and you may need to replace the keyboard. This is labor intensive but only costs about $20.
+
+UPDATE
+
+[image|2147811]

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crwdns2934249:0crwdne2934249:0:

Start by
[image|2147011]
getting a USB to SATA adapter:
https://www.amazon.com/Adapter-Cable-Converter-Drives-Solid/dp/B073SXTY64/ref=asc_df_B073SXTY64/?tag=hyprod-20&linkCode=df0&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936&psc=1&tag=&ref=&adgrpid=82240853001&hvpone=&hvptwo=&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936
-Remove you internal hard drive, hook it up to the adapter and boot. This will tell you if the hard drive/IR cable needs to be replaced (using the 2012 model).
+Remove your internal hard drive, hook it up to the adapter and boot. This will tell you if the hard drive/IR cable needs to be replaced (using the 2012 model).
-A new cable will also allow you to install an SSD 2.5” drive to keep your machine running twice as fast. You will be able to boot from your old drive, format and install a system on the new drive and then use Migration Assistant yo move your data.
+A new cable will also allow you to install an SSD 2.5” drive to get your machine running twice as fast. You will be able to boot from your old drive, format and install a system on the new drive and then use Migration Assistant your move your data.
Next hook up an external USB keyboard and see if the keys will work. Your machine may have received liquid damage and you may need to replace the keyboard. This is labor intensive but only costs about $20.

crwdns2915684:0crwdne2915684:0:

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crwdns2934249:0crwdne2934249:0:

-Start by [image|2147011] getting a USB to SATA adapter:
+Start by
+
+[image|2147011]
+
+getting a USB to SATA adapter:
https://www.amazon.com/Adapter-Cable-Converter-Drives-Solid/dp/B073SXTY64/ref=asc_df_B073SXTY64/?tag=hyprod-20&linkCode=df0&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936&psc=1&tag=&ref=&adgrpid=82240853001&hvpone=&hvptwo=&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936
+
+Remove you internal hard drive, hook it up to the adapter and boot. This will tell you if the hard drive/IR cable needs to be replaced (using the 2012 model).
+
+A new cable will also allow you to install an SSD 2.5” drive to keep your machine running twice as fast. You will be able to boot from your old drive, format and install a system on the new drive and then use Migration Assistant yo move your data.
+
+Next hook up an external USB keyboard and see if the keys will work. Your machine may have received liquid damage and you may need to replace the keyboard. This is labor intensive but only costs about $20.

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crwdns2934249:0crwdne2934249:0:

-Start b t getting a USB to SATA adapter:
+Start by [image|2147011] getting a USB to SATA adapter:
https://www.amazon.com/Adapter-Cable-Converter-Drives-Solid/dp/B073SXTY64/ref=asc_df_B073SXTY64/?tag=hyprod-20&linkCode=df0&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936&psc=1&tag=&ref=&adgrpid=82240853001&hvpone=&hvptwo=&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936

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crwdns2934249:0crwdne2934249:0:

Start b t getting a USB to SATA adapter:

https://www.amazon.com/Adapter-Cable-Converter-Drives-Solid/dp/B073SXTY64/ref=asc_df_B073SXTY64/?tag=hyprod-20&linkCode=df0&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936&psc=1&tag=&ref=&adgrpid=82240853001&hvpone=&hvptwo=&hvadid=385191927323&hvpos=&hvnetw=g&hvrand=2452714866290663035&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026578&hvtargid=pla-822333677936

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