2nd monitor has no reds

I have just installed 2 new monitors.
One is a Samsung hd tv. The other a Samsung Syncmaster 913n.
The tv works fine there are connectors for my mac, xbox, freeveiw box etc.
I have just got another dvi to vga cable for the 913n and all the colour has gone out of it.
I have used this before and it was fine.
It would appear that all the reds have gone.
Anyone have any Xmas ideas.
G5 2.3 Dual Core   Mac OS X (10.4.8)  

Which video drivers are you using?

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