If this has a power supply have that checked out, I just had to order one for another tree that would not work. In this case there was a set of wires that shorted out and caused the power supply to fail.
If the tree does not have a power supply (it just has a wall plug), then there is typically a small fuse in the plug that may have failed. Finally, if this is an incandescent lamp type, you will be in for a LOT of testing, I spent almost 2 hours last Christmas finding 3 burnt out lamps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
Last edited by villagetinker; 11-20-2021 at 09:18 PM.
Reason: added info
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