Video Noise on any monitor connected to PC

[nipsmg]

I recently modded a TV set for RGB and am connecting to it using a video card and crt_emudriver.  Yesterday I noticed some pretty severe noise and wavy lines on the picture.  I had initially figured it was due to unshielded wiring used to mod the TV, and maybe the flyback was causing some issues.   So I plugged an LCD monitor into the integrated graphics (separate video card) and saw the same exact pattern.   The pattern persists on the LCD attached to integrated VGA when I completely disconnect the CRT.

Any idea what would cause that?

I took a video.  You can see the noise somewhat, but it is much more pronounced in person.




Suggestions?

[buttersoft]

Assuming we're not looking at what appear to be physical marks on the screen above and to the left of the windows logo in your vid...

I would guess at interference, and if the CRT is not only disconnected but powered down, it'll be power related. Do you have another powersupply you can try? Even a cheap, low powered one would be fine to try with your GPU unplugged.

[big10p]

Can't really see anything in the vid. Almost certainly power related or a ground loop. Need to know more about exactly what your setup is.

[nipsmg]

I'm 90% sure it's bad PSU.  I'm able to alter and even elminate the noise by manipulating the cables coming out of the PSU. There's something bad happening there.   Just ordered a new modular PSU (and some new VGA cables to be on the safe side), both will be here tomorrow.

[nipsmg]

Quick update:

Confirmed.  Bad PSU.  Replaced with new PSU, picture clean and stable.