are you using a relay wiring harness? one ballast is being starved of current as the other ballast ignites. usually when you here the buzzing you should be able to see some arcing takingplace inside the bulb. sometimes this happens on my cheap-o ebay fogs because i do not have a harness for them. simply turning them off, waiting a few seconds and turning them back on gets them both to fire. my harnessed morimoto headlights have never had a problem igniting.
2008 Vista Blue SES Coupe 5spd FRPP Zx3B Suspension
5000K D2S Retrofit
125,000+ miles and still on factory brakes and clutch!
Rep Points dont add themselves