Released June 2012, Model A1278. Intel processor with Turbo Boost, Up to 512 MB DDR5 Video RAM

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First aid found couruption that needs to be repaired

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How do I fix the courption ????

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The image you posted shows some distortion is that what your screen looks like. If it is I think you have deeper problems here ;-{

Can you give us the exact model you have as Apple has quite a few different versions! Paste in your systems S/N here EveryMac - Lookup, then post the system URL link here for us to see.

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Mid 2012 13 inch pro with Samsung ssd 500gb the screen looks like that because I took a picture of it with my phone

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Generally, You need to boot up under an external boot drive so you can run Disk Utility from it. This can be a USB, FireWire or Thunderbolt drive (depending on your exact model); or use a second Mac using Use target disk mode to share files between two Mac computers

While that can address minor issues, you may have a deeper hardware issue here. Like a bad drive and/or a bad HD SATA cable. But this depends on your exact model what is needed here.

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This worked thank you

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The computer always acted fine just that message was annoying lol

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Try booting into recovery by shutting down the computer and holding [command+R] during startup. Then repair the disk though Disk Utility.

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