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Mar 17, 2015 7:57 AM in response to _Subtractiveby jason269,Hello, _Subtractive.
Thank you for visiting Apple Support Communities.
I understand that you are experiencing an issue with HD scaling using an external display. Here are a couple articles that I would recommend going through for this issue.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT201177
Cheers,
Jason H.
