Is this a failing monitor?

White lines running horizontal. The screen shot does not capture the lines. I tried a digital camera and it's not very clear either. The areas in the circles were horizontal lines.
Is this a failing monitor or?
When I started typing the question there was scattered white lines or thin white areas running horizontal on the desktop.
Now they are gone. The computer has not been turned off and on, so the issue does not appear to be happening at boot and then after the system or monitor warms up the lines disappear. These lines are never vertical.
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nickg5Asked:
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CompProbSolvCommented:
If it changes as the monitor (not computer) is on longer, then it is an issue with the monitor.  I'd run the system until the lines appear, then shut off the monitor for 15 minutes or more (to let it cool off).  Then turn the monitor back on.  If the lines appear immediately, it is a problem with the computer (video card).  If they don't appear for a while (less than an hour), then it is a monitor problem.
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CompProbSolvCommented:
Of course, substituting another monitor would answer the question quickly, but I'm assuming you don't have that available.
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RaneeshIT SupportCommented:
If it is a picture tube based monitor, disconnect the VGA input from PC, switch on the monitor and observe for sometime, if the monitor is enabled with digital settings menu option, enter into the menu and observe it. Seen such issues due to long run and end of life in such monitors.
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CompProbSolvCommented:
If it is a CRT (picture-tube based) monitor, replace it!
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nobusCommented:
probably it is lacking connections on the horizontol display lines
so yes - this seems to be a display problem
as said - test with another monitor
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nickg5Author Commented:
The incidents are random and are intermittent the last couple days.
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nobusCommented:
you mean it often works ok ?
Nick - what monitor model is it?
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nickg5Author Commented:
Yes the event is intermittent. Yesterday 2 times.
Dell M780 CRT - age unknown but I've used it for many years.
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nobusCommented:
with a crt - horizontal lines are often caused by vertical deflection going bad
i would as first step give it a good clean up from dust, and check all connectors for burnt marks, and bad contacts
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nickg5Author Commented:
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