My low beam driver's side headlight would not turn on this morning, so I flipped the switch off and back on and both low beam headlights lit up. On my way to work the driver's side went out. I'm assuming it's the ballast (not igniter) since the headlight did light up, but went out when driving. What do you guys think? It's not the bulb because I replaced both bulbs last week. I have noticed the driver's side bulb isn't as blue as the passenger side (6000K bulbs), maybe that was a sign the ballast was going out.