Yes, this is a little annoying hardware problem. The image on my monitor is shaky, as if it is constantly moving up or down by about half a pixel. It's annoying, but bearable. I shall attempt to tell you everything I know about the problem. The monitor in question is a Samsung SyncMaster 997DF, 19". The same problem also happened with my Dell P793, 17" The Dell is a trinitron (aperture grille) type while the Samsung is a shadow mask type. I built my new PC, and hooked the Dell monitor up to it. I noticed that the image was shaky, as I described. It wasn't like that on my old Dell PC. I also noticed it when plugged into the output on my PowerBook, it had the same problem. Plugging it into the Mac mini resulted into a crystal clear image. (Yes, I do actually have 4 different computers on my desk) Thinking it was the monitor, I went out and purchased the Samsung, I also had been wanting a larger display for some time. Upon plugging it into the new PC, I noticed the same problem. Plugging it into the PowerBook, same problem. Plugging it into the Mac mini, same problem. Interesting... I have not tried to directly plug the new display into the Mac mini, it has always been through a KVM switch. The switch did not appear to affect how it displayed on the new PC or the Dell, however. - The new PC has a BFG 6600GT, the Dell a BFG 5200, the Mac mini a Radeon 9200 and the PowerBook a Radeon 9700. - When plugged into the PowerBook, the Mac mini or the new PC, it has been through a DVI->VGA converter. - Suspecting it was the card overclock that BFG does to their cards, I tried to underclock the 6600GT by nearly half. The image remained bad. - I have not tried plugging the new display into the old Dell, or directly into the Mac mini. I shall try this after I post. - Right now, my theory is that the DVI->VGA converters are screwing up the image. Edit: - I have tried running the monitor at both 1024x768 @ 100Hz, and 1280x960 @ 90Hz. They are about equal. Lowering the refresh rate in either case makes the image much worse. A big thanks to anyone who can, or even tries to help me.

Any motor around the screen would do (fans or things like that). A tv near by could do it as well...In fact, any electrical device could do it.

Ok, here are the results. And I think I discovered something that I'll figure out when I'm done typing.

The dell and the Mac mini were both shaky. However, I noticed that placed behind the monitor was something that could easily cause interference: The large transformer that belongs to my speakers :)

Let me test it out, and I'll get back to you in a sec.

Wow.

Wow.

I FEEL EXTREMELY FREAKING STUPID

Not once in my testing did I ever think of removing the DC transformer sitting directly next to, and touching, the monitor.

Removing it and then degaussing solved everything, and it explains why the Mac mini + Dell monitor didn't have a problem: It was a good 8 feet away from the transformer. Yes, that's right. I have the brains to write programs, but I couldn't make the connection between a large transformer sitting 3 inches from a monitor's electron gun, and said monitor having distortion.

I really feel dumb :(

Thanks for your help.

Edit: The reason that the Dell combined with the Dell monitor never had a problem is because the speaker power supply wasn't there until I built the new PC.