External "Dual" Monitor not recognised (PowerBook)

Using Leopard my PowerBook no longer recognises an external monitor (Dell 17"")
Behaviour is as follows - Plug in the monitor, slight screen flicker to blue then returns to normal desktop
When booting off a Tiger partition (to enable access old Mac OS9 apps) the external monitor works OK
I antisipated 10.5.1 would fix it but it didn't ...
Any ideas ?
Thanks

I agree with you, to display the output on the second output can be done with the FN+5 keys. I am extending my desktop to the second graphics port so that programms such as powerpoint can "Display on second monitor" whilst opperating from the primary screen. The problem is that in order for the second port to be recognised by windows it has to have a monitor plugged in to it, but I have only got a SVGA to Composite video frame converter & the laptop dosen't recognise it as being a valid monitor.

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    It is a superb  place to find answers and ideas!
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