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Thsi model has known problem with bad solder joints due to contamination, you need to remove the old solder on the four inductor leads, clean the leads eal well and resolder, see my pictures here: http://s807.photobucket.com/albums/yy352/budm/HP%20F1703/
Al so look to see any one of the capacitors have bulging top, they should be completely flat top.
3 ideas here. bad connections on the coils inside. the inverter board has gone bad, or bad capacitors on the power board or inverter board. all of witch should be serviced by a qualified service center.