It seems it was just 2013 when Yan asked a question about a Mac showing a strange display. I'm now getting exactly that display, on a Mac that seems to me to be around the same vintage as Yan's, 2010.
The responses to Yan's question talked about plugging in an external monitor. But if the video card is bad, won't the image in the external monitor be just the same one Yan photographed? In other words, doesn't the video signal to every monitor emerge from the same bad video card?
What can I do to retrieve the files from my Mac without allowing anyone else access to these files? I would be willing to replace the Mac if that would somehow facilitate. Is there really a way to just plug in another monitor, or some other new hardware, into the old Mac? If I have to take the Mac to the shop to replace the video card, will that allow the repair shop access to my files? Is there a way to get the files from the Mac without replacing the video card? What are my options?