This happens to my F700BT as well. The only thing to reset is the illumination colour, i.e. all cables are ok. It's driving my crazy and applies to both Hybrid 4.01 and 3. I've tried holding the memory buttons and calibrating the screen, but on every second reset the horrible blue colour is back.
I imagine a workaround could be to alter the default illumination colour, but I've yet to find out where they are stored. Anyone with ideas?
Thanks!