Based on your forum name, I'm assuming you have a 97. Porsche started offering litronics in the 99 model year. This post Litronic Fuse Size? implies that you may need to replace a 7.5 amp headlight fuse with a 15 amp.
I suggest that you check the fuse first since that is an inexpensive fix if that is the problem.
I have had occasional trouble seating my headlights when I install them. I would double check that they are actually connecting by confirming the other lights in the assembly are working.
After trying those options, I think it would be time to buy one ballast and see whether that works. If both lights were working when removed from the car, it seems unlikely that both ballasts would fail during a short time period, but I suppose it is possible.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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