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I need to operate a CRT monitor in 100 Hz (1280 x 1024) on a Leopard Machine. The same monitor was working fine on a Tiger machine in the mentioned range but I switched to Leopard and it does not show the 100 Hz option in the list any more (but I am sure the monitor can support it). Is there a way to manually modify the list?

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This handy utility SwitchResX can give you the option to adjust your monitor settings.

There is also this utility (which I haven't tried/tested)

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thanks. But is there a system call or command line utility or some API to do this. I tried both the utilities you mentioned already and they don't work for me (I can't get to 100 Hz in 1280 x 1024 and I am sure my Monitor supports it). – Ali May 3 '11 at 15:20
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So far it seems that there is no way to do this. I ended up changing my Graphics card to solve the problem.

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