I have just bought a new computer from Mesh with a Mitsubishi Diamond Pro 750 SB monitor. No problems with the computer. However the monitor has two thin lines one about a third from top and the other a third from the bottom which is obvious when working with a white background such as Word. When I contacted Mitsubishi, she said this was normal and these were wires going through the monitor? Is this true? I would be gratful for your help.
My Diamond Pro 740SB bought as part of a system from MESH like yourself has these lines you mention. The monitor I have on loan, at the moment from Mitsubishi, the Diamond Pro 710 while mine is in for repair (nothing to do with the lines by the way) has these lines as well. This seems to be a common thing. As you say you only notice the lines against a brilliant white background.
Even although my Diamond Pro 740SB conked out after 14 months I would buy another one without hesitation.
Up to now I can't praise Mitsubishi Customer Service enough! If you are unfortunate to require a repair within the 3 year warranty period they pick your monitor up and lend you one of an equivalent size and specifications for free. They even provide a box to take your monitor away and bring it back. MESH has no part in it. You deal direct with Mitsubishi.
The Trinitron and Diamondtron (built under licence from Sony by Mitsubishi) all have the two horizontal lines, which are the supports for the aperture grille (wires stretched vertically down the screen).
Ordinary tubes have a shadow mask, which is a metal plate with holes in it.
These lines, are, as pointed out very normal and there is nothing wrong with the monitor. Its one of those things that is fine till someone points it out to you or you notice it and then you can't help but look at it!