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Strange coloured lines

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I think this problem is caused by my graphics card or monitor, I don't know exactly what is wrong though. I have already tried updating drivers and cleaning and re-seating my graphics card but I still have the problem. The lines appear on my screen and sometimes go only to reappear a few minutes later. Also whnever I play a game it will crash within a couple of minutes and my PC will either reset or I will get a VPU error. A screenshot below shows the lines. The problem started one day, and I hadn't changed anything on my system for weeks I don't know why it started happening. I have a ATI Radeon 9700 Pro graphics card and a Samsung syncmaster753DFX monitor.

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The fact you were able to grab a screen capture proves it's not your monitor. Sure looks like a video card problem. Wouldn't hurt to update the drivers, or maybe underclock the RAM.
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Judging by the green cast as well as the lines, I would say your monitor is faulty, not the graphics card. The monitor is of the CRT tube type, which relies on three colour-guns (red, green & blue). If any one of the guns fail, the result is a colour-cast such as in your picture. A quick confirmation that it's your monitor at fault is to try a different one in it's place if you can borrow one.
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