Using Yosemite - cannot project screen onto TV.  Get bits and pieces or black screen.  Have been using same setup for years.

Using Yosemite - cannot project PC screen onto TV.  Can get a black screen or bits and pieces of a screen ( not always the one displayed on PC).  Have been using same setup for years.
Thanks for any help

Hi, edward.  
Thank you for visiting Apple Support Communities.  
I understand that you are having a display issue with your MacBook Pro on your TV.  I would need a little more information regarding how you are connecting your device and what content is being displayed to provide a better answer.  However, here is the best troubleshooting resource to go through when experiencing these symptoms.  
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT201177
Cheers, 
Jason H.

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