GO.
GO!!
Remember, any time something happens in the high speed RTO regime, you don’t have time to diagnose. With the exception of the items listed in your briefing to STOP, most other malfunctions are far more likely to compromise your STOP capability than your GO capability.
I’m not familiar with the 777 however on most types, the simultaneous loss off two screens is not going to be a coincidence. Odds are the screens are fine, but you’ve lost the associated SG or both have no power, which means a bus failure.
but you still have 2 sets of instruments and two engines, so it is perfectly safe to take off.
Once safely airborne, figure out root cause (even money says you’ll find other stuff is unpowered off the number 2 busses, or the SGU is screwed. Run the appropriate NNCs and then TDODAR (or whatever your company decision making tool is). The continue or return decision is going to be situational.