Screen shaking on 2nd display

had my imac for about a month now and just connected to my 26inch sony hd lcd through the vga input and sometimes the screen shakes ever so slightly. does anyone know what could be causing this? i have a gig of ram and the 256mb graphics card.
it is a subtle shake when i put it up to the maximum resolution on the hdtv which is 1280x768. on lower resolutions it's fine. the strangest thing is that sometimes it works fine with no shake. could there be any interference from something? i've checked bout ends of the cable and they are both secure and properly plugged in.
please help!!

Hi Jason
I know ScreenSaver takes over both displays!
A cool trick even better than ScreenSaver is to use iPhoto and build some slideshows with or without iTunes tracks, then play them on one display while working in the other!
Dennis
17" iMac Intel Core Duo 1.5GB Ram Mac OS X (10.4.9) Maxtor 300GB FireWire Creative Inspire 2.1 2G Nano

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