Nothing coming from Air Con / Vents

[robocal]

Started the car yesterday and nothing was coming out the air vents. Tried with the AC on and off. Tried pressing MAX and still nothing. All the indications on the AC panel were correct but nothing coming from the system. Did some reasearch on the site and the final stage resistor came up quite a few times. Could failure of this part cause these problems or could it be something to do with the blower fan. The fan in front of the radiator is working but not sure if this has anything to do with it ....probably not.

Thanks in advance for any light that can be shed on this issue.