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My suspicion is that Viking sergers (905, 910, 936) bind up after heavy use and years of service. In other words, they are not "lubricated for life". Can you turn the handwheel on the machine? If not (or if extremely hard), you now know what the motor was dealing with. My guess is the motor is burned out, but you need both a total overhaul of the main shaft bearing system (cleaning the bearing and relubrication), and, a new motor. I probably should consider repairing sewing machines in my retirement.
You 910 serger doesn't have the option for a Chain Stitch. It is a 2, 3, or 4 thread serger. You can do a good number of different stitches but a chain stich is not one of them.
If what you mean it that it won't "chain off", meaning sew with no fabric beneath the foot as you gently pull the thread towards the rear of the machine, that could be for a number of different reasons. First, change the needles and unthread the machine and start over. If the threads are not exactly where they should be, your serger won't sew correctly. A great video on threading your machine can be seen at:http://www.husqvarnaviking.com/mediafiles/huskylock/index_en.html