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A list of things to try, in order (I'm writing an answer instead of a comment for better formatting). Run hash -r after each step (assuming you're in bash; do rehash instead for zsh; or you can always open a new shell). Run brew --prefix and see if the output is /usr/local. If not, your brew is not installed to /usr/local! Add $(brew --prefix)/bin to you ...
You may already know this, but there is an apple repair extension for these kind of issues now. They'll fix it for free. https://www.apple.com/uk/support/macbookpro-videoissues/
I ran into a similar issue a while back. You will need to diagnose the video card with a diagnostic utility 1) Download, burn, and boot Ultimate Boot CD. There are a number of video utilities you can run that will test out your video card for you. Since you are no longer booting OS X when you boot this CD, you are bypassing any software issues you may ...
Yes. You can't move a photo from iPhoto out of the library simply by dragging it. It'll be a copy, therefore deleting it from the desktop will not remove the original from the iPhoto library.
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