Hi,
It seems it can be related with video card? Have you tried to take out the computer TR card, clean contacts and reseat the card?
Also I remember, the screen not rendering might be related to the TR code running on the computer can't read TR objects. IIRC, the main fader level recall is not going through the TR interface, but rather through the standard VCA voltage. You should check the TR bus driver under the keyboard and see if you don't have any components fried.
Cheers,
Artur