Why doesn't my DVI-I to RGB cable work?

I’m a little confused about what works with what, so tell me if I’m wrong:

(1) The display on the normal television works fine when using the VGA port (with a single cable connecting the PC to the television and no intermediate converter).

(2) The DVI output is hooked into a YPvPr converter, which when hooked into the television causes the issue.

I’m unclear on whether when you say it’s extending the desktop to a second screen that it means there are multiple screens plugged in or that it is simply reading multiples.

It might also help if we knew the model television, year, and available inputs for it.

Is this the scenario?
-You have a normal PC monitor connected via VGA, and it’s fine.
– You have your TV connected via the adaptor cable connected to ONE (or BOTH?!?) of the DVI dual connectors and you get pink static? (BTW, it should be ONE of the DVI-I’s only, not both.)

The first thing I would do is go to the control panel provided by the software that comes with the graphics card. On the PC I built, the graphics control panel allows you to choose which outputs are active and what type of displays are connected to them. If none of this helps, I would go another way… try to find an HDMI to YPbPr adaptor and try that output. I know cables are expensive, but your time is worth a lot too. Don’t kill yourself trying to make one option work if you haven’t looked for an easy fix.