It’s the pinout. Obviously, the cords you’re buying are NOT identical
If you’re using a Third-party cord, you’ll need to use a Continuity Tester to figure out the difference.
My guess is, the COMMON is in a different place, and no amount of changing the order of cables will make a difference if that’s the case.
If the COMMON is correct, and it’s the R/G/B that are different, then all you’d get is weird colors, not a total lack of video…
Also, PLEASE make sure you’re plugging them in into the right jack. I can’t tell you how many times I’ve plugged into the wrong one because the labels are hard to see, and more often than not, I’m looking at them upside down…
The best option is to stop trying to buy a new 3.5mm to RCA cable, and just use an EXTENDER which was suggested before… Something like THIS:
or something like THIS, which you can get at Radio Shack:
any standard RCA-to-RCA component cable.