This is a VERY common issue. I have this problem on my Maserati right now it's most likely your igniters not the bulbs even though they probably could use some replacement also. You can get a HID kit from ddmtuning for cheap and they work fine. They come with the HID ballast/igniter AND bulbs for only like $40s.
"Be yourself for who you are, or be no one at all" - MalibuMafiaV
BMW 2006 M5 - REALLY LOUD
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