Thanks D.P.! Good advice!

So, today I took my ballast to my local hydroponics store. They have a sweet lighting system tester setup. Right away the knowledgeable employee told me it was the ignitor. He came to that conclusion because the bulb didn't attempt to fire. Like I stated above the transformer hums but no sparky, lighty. I figured this was the part that was bad but wanted the advise of a professional. He mentioned if it was a capacitor the bulb would light but then fluctuate.

During my troubleshooting search I found a great website...

http://www1.eere.energy.gov/building...ance_2003a.pdf

It's got a great troubleshoot guide to help track down the broken part in your HID system. This PDF has alot of information...big words...and can be a bit confusing if you're not use to electrical. I would suggest if you have any questions on any part/parts in your lighting system, get the help of a licensed electrican! No one wants to make a wiring mistake which could end in a fire, or worse, death.

I found that there is no real easy way to tell if the ignitor is bad. The website says to replace the ignitor with one from a working light. I dont have another working 600w hps so I'm going to cross my fingers and hope I'm right!?

I've located a new ignitor online, a direct replacement for my 600w Hydro-Farm ballast. $36-$45, much cheaper then scrapping the old ballast and buying a new one, IMO! I'm going to order one, and do a repair post on this thread! I hope this may help anyone else with a similar problem.