You have left out TWO very important steps.  A) tools needed: a - fine tweezer and b - magnifier glass [ and a lot of patience }.

With the open computer facing you. On the left side two gold electrode wires connect to the motherboard, note the wire placement of the two.

On the right side there is a ribbon connector on the right side. NOTE, when the monitor is lifted out, these will COME OFF. If you are a notice, you will be lost. My guess the new monitor will have these connector.  To rebuild: place the set screws for the monitor and then the left and right rear brackets. Go back to front view and insert the back ribbon connector to the motherboard on the right backside. Take a break. Use the magnifier glass and tweezer and attempt to align the SMALL ELECTRODE heads. When aligned they can be pressed on, a light snap will be heard. Please be carefull. This step took me 1 hour. After these steps, continue re-assembly.

Regard,

D C