Mac Book Pro fail to properly recognize Apple 23inch HD monitor

Hi
I have a brand new mac book pro, 2.4Ghz, 15 inch, 4 gb and so on... I just upgraded to leopard, and everything works fine except that when I try to hook up my external monitor which is an Apple 23 inch HD monitor, the external display flickers every second on and off. Even if I open the lid, both displays flicker on and off.
It goes on forever like this. I don't "think" it's a hardware problem because it worked with tiger and it works at work with a non Apple 22 inch display (that will teach me...).
So it seems to only happens with the Apple 23inch monitor.
Any idea how to troubleshoot that one ?
thanks

wrong forum sorry

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