White spot on Sony TV when used as external display

I have my macbook (late 2007) connected via mini-DVI -> DVI -> HDMI to a Sony Bravia 1920 x 1080 LCD TV. If I don't mirror displays I get a white spot on the TV in the lower left hand side of the screen. I thought it was a bad pixel but it disappears if I change to mirroring and it moves around if I change the screen resolution on the TV. If I try another Macbook with the same setup no white spot so I figure the TV and cables are OK. Techtool Pro says the video memory is OK.
Any ideas what could be causing this ?
Thanks - Michael

I've had something like this happen to me a couple of times, but it always went away after a restart so I couldn't fully diagnose it.
Start out with a safe login, which will disable any programs that are set to open with your account. Enter your password, then hold down the shift key while clicking "Log In". Keep holding it down until you can see the desktop.
If the white spot is gone, go to Accounts preferences, note what's there, and start removing programs, logging out and back in after each one so see if the problem returns.

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