Jagged wavy lines edge of CRT display with Dual Core Mac mini

My friend recently bought a Dual Core Intel Mac mini and when hooking it up to a 19 inch MAG monitor there are often wavy lines on the edges of the screen. They go up and down both sides, are jagged, and also are not static but moving quickly. Sometimes it seems to behave normally while other times if it doesn't show up on the boot screen it will show up after a little bit of use.
At first it seems that the more stuff I opened the worse it got, so I thought it could be the shared video RAM as he did not upgrade from the original 512 , but that should only slow the computer down anyway. Now I think rather than the RAM I think it could be related to the Apple DVI to VGA adapter, resloution/refresh rate, or just bad video hardware. I can't rule out that it just won't play nice with the majority of CRT monitors out there either. Sometimes changing the resolution/refresh rate helps and other time it doesn't. From what I heard my friend experienced wavy lines somewhat on his own monitor but I don't think it did it when using a DVI to HDMI cable to his Sony 50 LCD (and I didn't see it when hooking it up to mine either).
If anyone has any idea what could be going on I would greatly appreciate it. The reason it is so important is that my friend decided that the Mac mini was kind of an impulse buy and didn't need his iBook and another computer for his TV so he is going to sell it to my brother who is in need of a computer. So I don't want him to get into something that will give him problems right away.
Thanks in advance,
Robert

So is the MAG monitor your brother's monitor? That wasn't clear.
What you are seeing will most likely be limited to the MAG monitor. The MAG is experiencing some kind of noise coupling in to horizontal sync, likely from it's own power supply. You are correct that this will be related to the sync rate. Changing the vertical refresh to something higher, like 85 Hz or higher if available, might help to mask the noise. Also, power supply loading will affect how the noise manifests, so you weren't imagining when you thought that opening more applications made it worse. It didn't have anything to do with the mini but rather the different average picture level on the screen was changing the monitor's power supply loading and hence changing the beat frequency between hsync and the power supply's switching frequency.
I think it is safe to say most of what you see is bound to the monitor and not the mini. Furthermore, if you are stuck with this monitor, you can probably lessen the appearance of the noise by mucking with the refresh rate out of the mini.

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