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It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.
kdoran121, Some component part has failed inside your monitor!! Possible verticle drive signal is "bleeding" into the horizontal signal is causing your "wavy effect" to occur on screen. Electronic technician will need to troubleshoot problem down to "component level" to solve monitor problem. That's my best guess on this one. You could try to swap-in a known good monitor to your pc, just to prove that the monitor is the problem and NOT your pc!!! Yes, I still have a 9 year old CRT monitor connected to another pc and if and when it FAILS, I will send it to the curb on trash-day!!! 12fixlouie
If your kiddo "tinkered" on the keyboard, then it would look like the screen resolution or refresh rate was changed. The refresh rate is found under the display Advanced ---> Adapter ----> List all modes. Common refresh rates are 60, 72, 75, 85 and so forth, measured in hertz. These values are paired with the screen rssolutions, 800 x 600, 1024 x 768 and so forth. Selecting one of these modes will hopefully get you back to seeing the full display.
Some video card driver/utility software has the capability of actually adjusting horizontal position left or right. This adjustment should also be accessed in the display properties.
If the kiddo tinkered with the monitor buttons, then you must access the particular adjustment having to do with display horizontal width and horizontal position. One of the buttons gets you into the menu mode, another to the proper adjustment selection, from there two buttons are used to increase or decrease width, or move display left, move display right.