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Depending on the type of ballast...
Last time I opened up a fluorescent e-ballast (T8F15, 120VAC in) it had a single coil, assorted capacitors (polymer, ceramic, and electrolytic), 1 power transistor for each light, and assorted resistors and diodes. I'd venture that 80% of the time its the electrolytic cap, and then 10% of the time its the transistor. A busted cap should be obvious.
 
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