The display problems you are having match exactly what my unit did after I blew one of the fuses near the display connector on the main board (from plugging the display connector in slightly wrong, oops).

Replaced the fuse, all is well.

There are three small white rectangular fuses around near where the display cable connects onto the main board. The blown one was the one closest to the docking connector. One can check it with an ohm-metre without much fuss.

-ml