DJJASONX Said:
"2015 macbook pro: replaced my Hard Drive to a 1 tb and my macbook pro keeps giving me a black screen whenever i try to download a program. does anyone have any solution for this issue?”
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Reinstalling the macOS:
This is a consistent error, and it is occurring on every download, correct,
If So, then you need to Reinstall the macOS:
Sometimes, changes are made to your Mac (i.e. Updates), and then settings (i.e. for Safari), become manipulated, technically. So, reinstalling the macOS will place moved items back to where they should be, and will replace damaged system files.
1. First, Back up your Mac:
Create a Time Machine backup of your Mac, so that you can have something to restore your Mac from, should anything go wrong with the reinstall.
2. Then, Reinstall the macOS:
Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be. Go Here: How to reinstall macOS from macOS Recovery - Apple Support