Radeon doesn't see red

[PGit]

A rather odd phenonemon has occurred, my PC with a radeon 9550 is incapable of displaying red, using other colours instead, such as white blue, black and green.

Is this a common problem, I havn't changed the colour settings and I'm hoping the graphics card hasn't developed a fault. Is there any way of testing it?

[PGit]

Thanks. It seems the monitor cable is the problem, the pin at the bottom right is broken.