The easiest thing to try is replace the needle with a brand-new needle. If the needle is bent or damaged, it may not be engaging with the bobbin thread correctly. Also make sure it is installed with the flat side facing the correct direction. Be sure to Raise the presser foot before threading the upper thread so it will seat properly in the tension disks.
Perhaps the following will offer some help:
Sewing Machine Needle Not Catching Thread
Needle not picking up bobbin thread Threads Magazine Gatherings Forum...
If there continue to be problems, the timing of the needle and hook could be off.
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