No light means no electromagnetic waves of any frequency since if they exist at a single frequency, you can always blue shift or red shift them by changing frame until they enter the visible spectrum.

Electromagnetic waves are an unavoidable consequence of the electromagnetic interactions. Remember that Maxwell predicted them on the basis of his equations, and afterwards proposed that light was part of the spectrum.

So no light means no electromagnetic interactions, in particular, no Coulomb force.

But that means no atoms, no molecules, no chemistry, no matter as we know it.

No electromagnetic interactions mean no weak interactions as we know them for the SU2 X U1 gauge theory would have to be replaced by something else (or nothing) since electromagnetism is an unavoidable consequence of it.

So the slow process of hydrogen fusion which is the basis of stellar energy would not exist. Actually, it would be replaced by much faster processes.

Indeed, if things like (chargeless) protons and neutrons existed, they could rapidly fuse to make a monstrous nucleus without the limits in size that are imposed by the electromagnetic repulsion in the our world.

All baryons in the universe could collapse in a gigantic nucleus. Leptons would all be neutrino like. Maybe they could make a gigantic, unique, gravitational atom with the monster nucleus. We could figure that out easily.

Apart from that, you could still have dark matter and dark energy and you could call that the universe. Clearly not one of the most hospitable kind.

Note that in the landscape of the possible vacua of string theory, you can certainly find many places corresponding to electroweakless theories. So if you believe in megaverse..but the adequate word here is really 'believe'. I don't consider it as a scientifically decidable possibility.