Sounds like hook/needle timing is off. Check it by doing the following with the power off:
remove bobbin, bobbin case, and needle plate.
push needle all the way to the left.
Turn handwheel toward you watching the needle and bobbin housing hook. The point of the hook should line up right above the eye of the needle.
If not timing, clean bobbin area removing lint and thread.
Check bobbin tension, should get slight resistance when pulling thread.
Make sure using only Husqvarna Viking bobbins.
Make sure the bobbin is unwinding in the correct direction.
Remove fabric. Pull extra long bobbin thread (about 3 inches). Hold upper thread tail in left hand, turn handwheel toward you for 1 revolution. Is the bobbin thread caught by the top thread and pulled through the opening of the needle plate?
If you are still unable to sew, take to an authorized Husqvarna Viking dealer for service or have them send to Husqvarna Viking (SVP) Technical Service Dept for repair. A list of dealers close to you can be found at the Husqvarna Viking
website -
http://www.husqvarnaviking.com/usGood luck.
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