SC,
Sounds like when we take are car to the shop; "goes in with one problem, get
a call and it has a new problem"
I would say that it lies in your monitor being defective or needs attention,
you might try checking your cable going to the computer and why your at it
take a few minutes if you have the ability to do so and remove the case cover
from the monitor and gently give it a good vaccuuming out, DO NOT use a air
compressor as it will blow in moisture from the tank of the compressor. You
can buy cans of Air at your local Wal-Mart or Office supply store.
Monitors have a high magnetic field which draws dust which in turns lies on
your circuit board and makes a small disturbance...
Regards,
L391