LCD Flat screen and PGX64 in a Sunblade 1000

Hi Folks

I bought a new Philips LCD flat screen over the weekend. It's a 220EW.

I cannot seem to get it working with the PGX64 in my Sunblade 1000. I  
connect the Sunblade 15 pin VGA to the VGA input of the screen but  
nothing appears and the screen says "No Input". I've tried a number of  
different resolutions and frequency combinations with m64config none  
of which work. Also tried several different combinations from the ok >  
prompt using setenv output-device screen:rNxNxN

Googling doesn't turn up much. Does anyone have an idea why this might  
not be working? It's not a wasted purchase as it was a good price and  
I can use it with my Mac. Can anyone recommend a modern LCD screen  
that will work with the PGX64?

Best regards

Ben