if you guys would read his thread he eludes to BOTH of them going out at the same time...the odds of both ballasts or both bulbs burning out at the same time vs a fuse or relay knocking them out really very very slight.
It was a simple question. Better to start small and then work your way up. For all you know the fix could be a simple flash of the brights while the car is running to help power jump to the ballasts. Wouldnt be the first time this has happened.