With liquid damage it's hard to say for sure what the issue might be. When you cleaned it up, was there corrosion anywhere? Where did the liquid actually go in the machine?
To throw my opinion in even before I have answers to those, it sounds like there may be issues with some thing in the display circuitry. Either in the screen itself or on the board. Cleaning was a great step but it doesn't undo any damage which was already done.
The generic display drivers in windows give basic function. Lower resolutions, etc. When you install the proper drivers it may require higher power draw which it can no longer support.