Firstly check that needle has been placed into the needle holder the right way, ie flat shank to the back. If you look closely at the needle there is a cut away at the back called the "Scarf" and this must face to the back of the machine as the rotary hook swings through there and catches the thread to make each stitch.
Also, check needle is fully up into the housing.
There is some good trouble shooting tips and tricks on this website.
http://www.sewusa.com/Sewing_Machine_Repair/Sewing%20Machine%20Troubleshooting.htm
So check needle is in the right way, check threading up is correct and thread is in the needle eye. If none of these resolve the issue, then it is possible you knocked the timing out when you broke the needle. Remember, never drag fabric as it is stitched, let the machine feed it, you just guide it. Dragging is a sure fire way to break a needle.
If timing is out, (you can see info on what this means on
www.sewusa.com site too) then you probably need to take it for a service to address this issue.
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