As the title really, I have 2 identical 19" TFT's and the left hand one has turned blue, I cannot get it to show white at all, I have been through all the OSD menus to no avail, it is almost like a CRT with a gun gone.

Any ideas?

Make sure (if VGA) cable is fully plugged in, they can get into a state of half attachment if not screwed in and make the screen go predominatly one colour.

Yep, ususally a VGA cable not seated, cracked, oxidised pins. Often just unplugging and replugging back in cures it.

Also I've noticed several dual head set ups (specifically using Dell PCs + TFT) where the 2nd screen has a noticable different hue to it.

It may also be that the dual head/other PC has a different gama setting. Try swapping over the monitors, if they swap colour problem then its the graphics card/PC set up.

Dicky connection at the monitor end, thanks guys, just proves you can fix anything with locostbuilders