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First is a rant about my bad experience with computers, then a question at the bottom of the post. You might want to skip the rant.
I'm about to give up PCs. Last year I paid $2750 for a Macbook Pro. I had MANY problems with it, and spent a year on phone with Apple to get my money back for it. I also bought an iPhone that didn't find any phone networks. Now I finally got a new iPhone and Macbook and they work well, but then I bought a new gaming PC for $1450 to play StarCraft II.
After waiting for two weeks I finally got it. I plugged it in and started it, saw the motherboard screen, and then...nothing. I opened it up, and found out that the power cable to the hard drive didn't work. I called the shop I bought it from, and they sent me a new power cable. I connected the hard-drive and started up the computer, this time nothing would stop me. Nothing, except the wireless network card. I had to spend 5 hours to get it to work, because it seems like D-link don't care about this model too much, so I had to manually install drivers. After FINALLY getting it to work, I waited the 10 hours for StarCraft II to download. When I started playing I noticed that the screen is flickering a little. It's like small "waves" are floating down the screen. I thought that it might be because of my 4 year old screen, so I bought a new. After connecting it, I found out I had the same problem.
Does anyone know why my screen has these "waves" and flickering? My graphics card is a Radeon 5770, and my screen is a Benq 21.5". I get them everywhere, not only in SC2, and they are especially easy to spot when the screen is dark.
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Anyone? I'm desperate 
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have you installed the video card drivers?
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just a thought but maybe you have uneven electrical flow in your house? Try using a surge protector or UPS... ur electricity supply may be fucking up your equiptment
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I have the video card drivers, yes. I have also tried changing hz, but didn't work.
I don't know about uneven electrical flow. What is a surge protector and UPS?
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I will try with a surge protector tomorrow. 
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Look up VSync and how to enable it with your video card. It's a feature that caps your framerate at your monitor refresh rate. Say you have a 60Hz LED monitor - that means it can't refresh its screen more than 60 times a second. Now, when the game runs at a higher frame-rate, that can lead to tearing in the screen (looking like lines, breaks or waves). So with VSync enabled it will not allow the game to run faster than 60 fps eliminating the problem.
EDIT: http://en.wikipedia.org/wiki/Vertical_synchronization makes it look as if what I described is not so much an issue with LED screens (which I assume your BENQ monitor is one). Give it a try though.
EDIT2: Just realized you said it occurs even outside SC2. If you run Vista with Aero, it might still be a VSync related issue but now I have to agree, it's actually more likely to be your power supply. Especially if you really got full-blown flickering.
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I turned on vsync through the catalyst center or something like that, but I still get it, especially while playing. I also have vsync on on SCII, so I don't understand how come I get it. Checked the frequencies, and I use a surge protector now. Still flickering/waves.
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What screen are you using? What cable do you connect your monitor with?
Flickering waves on a monitor is almost always some interference from another device nearby. Is your monitor close to your wireless router/mobile/stereo ? Try using the PC in a different place just to see if that makes a difference.
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I'm using a Benq T2210HD. I've tried several screens and several monitors. I tried removing my speakers, but didn't work. I also tried using the pc in a different place, didn't work :/
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It sounds like the motherboard isn't up to date to me. Are you sure the BIOS has been updated to the most recent version?
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I downloaded it, but what do I do with this .rom file?
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EPT
