This sounds suspiciously like a monitor problem. Graphics cards will either work or they won't. The monitor, on the other hand, is a mechanical thing (well, actually electronic, but is analogous to mechanical when it is translating the signal to what you see). If there is a monitor defect, it will show up as a bad display, partial display, or weird colors.
One thing I would suggest before running out and buying a new monitor (is this still under warranty?) is to hook you computer up to a different monitor to satisfy yourself that it is, indeed, the monitor.
Sounds like the lcd is bad but here is a way to verify that. Hook up a known working monitor to the computer, if the colors stay great after a few minutes then you know the original monitor is good.
If the colors turn blue and green after a few minutes with the working monitor then you know for sure that the video card is bad and the video card would need to be replaced.
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