Color problems with miniport to HDMI?

Hi, and thanks for reading.
I'm not very familiar with Macs, so I'm hoping the problem I'm having is straightforward. My wife has a MacBook Pro with v. 10.6.7 OSX and I just got a Kanex miniport to HDMI cable to connect it to our Westinghouse 720p LCD TV (SK-26H240S). The plug and play connection worked fine, and I can use the display in either clone or extended desktop mode, but the color is all wrong. I've tried changing all the settings on the TV and I've tried calibrating the color profile in system preferences, but nothing seems to work. I can get all sorts of different wrong colors, but not the right color. It seems like the data being transmitted for either white or black is wrong: a gray screen on the laptop shows up as blue on the display.
I have seen a number of other issues posted here about using these adaptors, but as far as I can tell, they are intermittent problems, whereas mine is always having the same problem. Any ideas out there?
Many thanks
<edit>I just noticed the laptop makes a humming noise ( ! ) when the cable is plugged in. Probably a red herring, but thought I'd mention it as it seemed kind of weird.

laura99 wrote:
I seem to have the same problem but mine will display my background screensaver. what should i do. it won't show anything else? Thanks ahead of time.
You have a different issue, which is probably not actually a problem. When you connect the TV, the Mac probably thinks of it as an external monitor to add space to your desktop. If so, it won't show what's on the laptop monitor because that's a separate area...but you can drag windows over there to the new monitor. What you are seeing is not any screen saver, but your desktop background, since you've added to your desktop.
If you want to see the same thing on both monitors, turn on mirroring with the displays icon in the menu bar. To customize how the Mac uses your external TV/monitor, use the Displays preference. There you can switch mirroring on or off, and also tell the Mac how the monitors are arranged.
If you turn on mirroring, the screen might not exactly fill the TV since it is probably a different resolution than the laptop screen, but under mirroring you can use only one resolution.

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