The most likely problem, is that there is a break in the "red" cable somewhere. This may or may not be in the monitor, computer or cable. As SF said, it could be to do with the solder, although it also could be the actual came. If the cable has been flexed quite a lot and bent over, it is possible that the wire is broken inside the plastic coating. This has happened to me before with an video projector. Just a thought!
If this is the case, simple solution, buy new RGB cable.
Hope u find a simple cheap solution anyway
Edited by polconv, 05 February 2006 - 04:17 PM.