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Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
Can you use a digital multimeter to verify the input and output voltages of the lamp ballast board?
Yes, it definitely seems you are on the right track - there should be voltage going into the ballast. It could be a bad rectifier or regulator or even a dried up electrolytic capacitor.
Could any of the wiring have been disturbed?
Have you tried several reboots in quick succession?
You can test the larger caps (>1uF) in circuit using an ESR meter - it will put a low voltage through the cap to test it. However if this cap is in parallel with other ones, or if you really want to be sure it is working, you could just lift one side of the capacitor and measure it that way. Or you could make a DIY in-circuit cap meter using a square wave generator and scope.
Ok, in that case your best option would be to just remove one cap leg from the board to test it out of circuit :)
Good catch! R6500 is a fusible resistor, so replacing it should get you up and running again.
If not, you will need to replace it anyhow to continue troubleshooting.
Yes that will work just fine.