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Nchardak pedestal won't accept a control cube
What happens
You can't place a control cube even though you think you have one.
PS5-safe fix
Make sure a cube is actually in your inventory; the red pedestal in the Aqueduct only shows 'Activate' when you have one. There should be two in the top blue pedestals of the Great Chamber and one in the blue pedestal of that chamber. A PS4 tip on UESP: go back to the main chamber, use the last cube on a boiler, then return. Leaving the area, fast travelling anywhere and coming back may also help.
Always make a hard save before trying a fix.
Tried the fix and it's still broken? Tell us so we can update this page.
Still broken on my PS5