I would follow these steps in order. Stop if one solves the problem.
Are you using any cable extenders or after market video cables? If so
try without them or with a different cable. If not go to next step.
Try removing and reseating the video cable (turn the
computer and
monitor off first).
Try resetting the monitor to it's default state (you'd have to read
the manual for that)
Try removing and re-seating the video card (turn the computer off to
try that)
Try running the monitor at a different resolution (and/or a different
refresh rate.)
Try updating your video card drivers.
Try a different video card
Try a different monitor.
I had to replace one thanks for your help.
RMA edwin lied to me. SOB
He did'nt fix the monitor.
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