Each of the 3 primary colors has it's own signal wire in the cable.  If the
cable is not firmly connected, then you could lose either color or
combinations of colors.
Since two monitors had the same "type" of problem but with different colors,
then
I would guess that the problem is definitely cable/connector related.

----- Original Message -----
From: "Huang William" <[log in to unmask]>

> Thanks Jim and Dean for the replays,
> I have done the first step as Jim suggested. Make sure all the monitor
cable
> connection are firmly and tightly. And so far so good, the screen seems
> quite stable at this time. I am still not sure the problem is soloved. I
> should mention that I used to using an old colour monitor with this
machine
> and it works fine for a couple of years then found RED colour gone. I
> thought that is the problem of the old monitor. After I changed to current
> new monitor everything is fine for about 6 month. then the BLUE colour
> become the ghost. The old colour montor is working ok with my old computer
> without colour loss. So I still suspect the video card is the problem or
> this just a coincidence?
>
> Thanks again
>
> William H
>
> <snip of the problem as below>
> William, this is rarely (but not impossible) a driver problem. It is
> a usually a hardware problem.  And that limits the problem to
> these three components:  the monitor, the video card, the cable
> that connects the two.
>
> The quickest and easiest troubleshooting test is to make sure
> all the monitor wires are connected firmly and tightly at the monitor
> and the back of the PC case.
>
> If everything is plugged in good and tight, then next move the
> monitor to a different computer (a friend or at work) to see if
> the problem follows the monitor.
>
> If it does not follow the monitor, then borrow a known good monitor
> and plug it in to your pc to prove the problem is in the video card.
>
> Good luck,
> Jim Meagher
>
> ----- Original Message -----
> From: "Huang William" <[log in to unmask]>
>
>
> > Hi, Listers
> >
> > I have problem for my PC 15 inch colour monitor. The monitor is standard
> > Super VGA. Sometimes the Blue colour just gone when system boot and
never
> > show on the screen. But sometimes is OK no problems at all. Is this
> monitor
> > hardware problem or the video driver problem?  Any idea what's going on?
> Any
> > suggestions ?
>
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