Macbook screen has gone all fuzzy

Yesterday I updated my mac with the new SMC firmware.
On the restart my screen has gone all fuzzy, and the colours have gone all strange.
It does this in both mac OS X, windows vista and the boot screen. When I take a screen grab of the screen and send it to another computer the image is normal, as if this problem did not occur.
I've done a hardware test from my install disks and it turned up no problem. I have also tried resetting the SMC firmware by turning the laptop off, unplugging the battery and holding the power button, but so far nothing has changed.
Any suggestions?
Thank you.

GfulDedFan,
Thank you for your reply,
I might have been wrong about the SMC update.
I got the update on my machine on the 17th, and I wasn't sure what exactly it was, and assumed it was the SMC update as it came out on the same date.
My machine is running an Intel chip set and was purchased in mid-2007.

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