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Well, diagonal wavy lines is an interference problem and typically does not really reflect on the quality of the monitor, but rather the quality of the video signal it is receiving.
My guess is you are using the computer's same video connection as your CRT, which would be analog via the 15-pin D-Sub connector. Analog is more susceptible to interference. And interference is typically introduced when the source is very near, or when the cable's shielding is damaged, or not grounded properly through the connectors.
The first thing to check is to make sure all the cables are securely fastened, on both ends, and not running parallel right next to power cords. Move speakers, wireless devices, or any large power consumer (like a big old CRT monitor with big magnets and transformers inside) away from the computer, monitor and cables. Turn off florescence lights and nearby TVs and radios and other electronics.
If the cables are tight, the graphics card (if not on-board) is secure in it's slot, and you isolated the monitor, speakers and cables as much as possible from potential interference sources and the wavy lines are still there, try the new monitor on another computer. If you see wavy lines with two computers (preferably at different locations), send or take the monitor back. You got a bad one. If the image is sharp and wavy free on the second computer, then something is wrong with your computer (a failing power supply can do this) or something in or very nearby your computer room has problems.
If this new monitor supports a digital connection via a DVI or HDMI connector, you should go digital to take advantage of it and really see the "quality" of the LCD's display. Besides a better image than analog, digital is not normally affected by nearby devices spewing out stray radiations.
BTW - While most LCDs offer better quality than CRT monitors, top of the line CRTs arguably outperform even the best LCDs. Since we don't have brand and model numbers of either of your monitors, I don't know were your two stand in the mix. But what is certain is that LCDs with a digital feeds outperform LCDs running analog. So if your new monitor has a DVI or HDMI connection, but your computer does not currently support digital graphics, and you don't do 3D animated gaming, there are plenty of inexpensive digital cards you can install that "hopefully" won't require a larger power supply. If the ultimate goal is to play the newer 3D animation games, then you should just start the budgeting process for a new power supply and a decent graphics card (and maybe more RAM).
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