Stupid Apple sense codes. The Mac knows which monitor is connected, knows the recommended resolutions & refresh rates, and only allows you to choose among the recommended values. If you hook it up to a video card w/ a VGA output and use a VGA->DB-14 (Mac) monitor adapter, you should have the same choices of resolutions as on your PC because the Mac won't have access to the sense codes anymore.

It's a case of Apple trying to do too much thinking for you. Sometimes it's a good thing, sometimes it isn't.

Peace,
Drew
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Power to the PowerPC!