When threading my Viking sewing machine., the needle won't pick up the thread. I.ve used it 15 years. This is the 1st time this happened. Help...

Do you mean it wont pick up the bobbin thread? You need to get into the user's manual on removing the bobbin shuttle that the bobbin holder clips into (actually pretty easy, I clean ours yearly especially if fuzzy material like velour is sewn) and brush the fixed area out that the bobbin shuttle floats in then reassemble and test. Also remove the throat plate/needle plate and you'll find that fuzz/lint gets between the plat and the feed dogs keeping the dogs from coming up fully.

Also if thread breaks one thing to look for if you've had needles break is a burr around the oval opening in the plate where the needle goes into it. Small Swiss file takes care of the burr and no more burr to break/cut the threads.

On rare occasions you may find the actual bobbin carrier (the one that holds the bobbin and is clipped into the machine) gets worn and wont stay clipped into the shuttle that holds it. Replacing the bobbin carrier is needed then. A1 Sewing on the net carries parts for the #1, #1+ etc.