I have recently noticed that I have some squiggly lines in the center area of the monitor. It doesn't show up on a white background but any other color background it shows up. At first I thought it was in the page I was looking at - kind of like a watermark - but now I see it on every colorderd page and especially when I view photos. Any idea what might have caused this or how I can get rid of them?
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Squiggly lines are sign of nozzles being partially clogged. Try using a needle to clear nozzles. You will need to remove the nozzles to do this. When re-installing the nozzles make sure they are in line with the pressure bar.
Generally speaking, this type of symptom is caused by AC hum leaking throught the power supply. This can be due to a bad filter cap. Since this clears up after a while, I'd start by looking for poor solder connections in the power supply area. If you can, check the caps in that area as well. I'll research this a bit and try to get you more details.
Since the image on the projector is OK then the problem definitely lays in you monitor. You might want to turn off any other electrical equipment in your lab, especially any kind of radio transmitter and see if that is affecting your picture. Strong magnets or large power cables can also generate magnetic fields that can adversely affect CRT pictures as well.
If that isn?t the problem then it is likely the monitor. It can be fixed; however, this is typically beyond the skills of the average user. Any TV and some computer repair shops can repair a CRT but is it economically feasible? A new 17? CRT can be had for $60 on-line and that has a 1 year warranty. Repairing your old monitor could easily run that or more and usually is only warranted for 90 days.
Let us know if you have any other questions and please don?t forget to rate this posting.