The flickering's not a bug, it's a feature! :p
After you repair the three panels there's an issue with the nEon supply. The town characters will talk about it.
You can always switch to another element (display color) using the Space key to get some improved vision.
From there on you're supposed to take the metro to the Mgmt District and press a button there, to "fix" the nEon.
After that you can take the metro back to Grand Central where the characters will say something differently again.
And that's basically the "ending" (there's no actual party or anything).