The Safari net surf tool is well known as the signature internet access engine of Apple devices.
To test this, sign out of your Google account.
Some hypothetical roots of these causes could include web client/ ip address verification or other Google imposed obstacles.
Software Based Problems
These problems stem from difficulties resulting from conflicting software on your system.
This option requires you to select applications or plugins on Safari and uninstall them.
If the black screen clears up after a certain tool is uninstalled, then youve found the problem.
This would include Ethernet cables and USB ports, among other wires.
Its possible to fix the black screen only on YouTube videos that are 480p or smaller.
When youre on Safari, go to preferences and then the privacy tab.
Once youre there, press cookies and then go to the details.
Cookies is a word that refers to your surfing app history.
Selecting all of the websites searched and then removing them will clear your net web surfer history.
Safari, the custom internet web client of Apple, is not a Google product or service.
Hopefully now you could use YouTube on your Safari online window without any interruptions.