Thanks very much for the suggestion - I have been trying to fix this for most of this morning! I tried fiddling with the colour settings and compared them although the Illustrator and Photoshop settings were the same anyway. I then looked up a tutorial on 'Peachpit.com' for advice on the best settings and have adjusted - but sadly still no change
When I print the affected documents on my laser printer they print okay so it does seem to be to do with the display.
I'll have another go with the settings I guess, just try combinations...
Cheers,
Diane.