HELP FAST! Colour Profiling!

[PhotoFantasia]

Hi guys, tomorrow morning i am off to the printers and tonight i was just preparing my images! For some reason, when i switch in the proofing from adobe 1998 to DS colour Fuji Frontier the colours go very dull and the blacks are not true!

Below is an example! Can anyone help??? Pleaseeee!!!

http://farm4.static.flickr.com/3368/...751739bf02.jpg
With Fuji Frontier printing profile. Simulation on!

And heres the original. As you can see the black is off!
http://farm4.static.flickr.com/3599/...6b8324cdc6.jpg

I don;t really under profiles fully, but i do have some knowledge, but i don;t know whats going on here!

Please help!

James

[Malcolm_Stewart]

Without taking your images in to Photoshop, on my CRT (Trinitron) monitor, it's the middle and lighter tones which changes from one image to the other. The blacks are below crushing level.