I have a Gateway FPD1810 (18") olderMonitor attached to my Gateway Computer that has thin horizontal black lines running across the screen intermittently. I also have another monitor attached to the same computer which is a Gateway 19" FPD1976W. This monitor works great and does not ever have black lines running through it.
When the lines show I give the monitor a little whack on the side of it and they go away but return some time later.
I have taken this monitor off my computer and attached it to my husband's computer (he only has one monitor so I had to use the blue cable.) It worked fine on his computer.
I then took his monitor and hooked it up to my computer and monitor and his monitor worked great. He doesn't want my monitor as it is not as clear as his.
I returned the monitor again to my machine and then the black lines appeared again.
My question is, what could be causing the noise (or think black lines running across the monitor). They are not always there but come every now and then and when I hit the monitor they go away but return again at a later time.
I have checked all the cables and they seem to all tight and since this monitor worked on my husband's machine and his worked great on mine, I can't figure out the problem.
Any help would be greatly appreciated.