Husqvarna 2000 sl no zig zag movement

Question

Hi there

I have just taken my macine out after my son's girlfriend used it and the zig zag is somehow switched or turned off. None of the programs that simulate an overlock work when I set the colours to blue, blue blue for the A cog.

We are going away and this is the only time I have to fix the hems on the trousers.Please can anyone advise.