display problem (probably OT?)

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(f34; gnome (is that relevant?), NVIDIA Corporation GK106 [GeForce GTX 660], Dell U2711)

This is a dual-monitor home workstation.

This afternoon, the left monitor suddenly started displaying only dim vertical stripes and lines and a black background, nothing else.  The right monitor still works fine.  It is the same when I switch the monitor cables on the back of the tower, at the graphics card outlets.  How do I determine whether the problem is the monitor, the graphics card, the graphics driver, or something else?

Is there something to look for in a log file?  If yes, what do I look for, and which log file should I look in?
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