Removing the red and black cable is unnecessary. Instead, remove the bottom left cable with 4 wires. That will disconnect the speakers.

I think he means the blue and black cables, which are held by the black frame.

Pry from the VGA port if it isn't giving in.

You can do this step after removing the black frame if you can't get the tab out.

Careful with the two metal nuts that are hidden below the plastic cover. The four screws of the back cover needs them.