It sounds like your amplifier isn't turning on.
Check these instructions on Renntech: http://www.renntech.org/forums/topic/19616-porsche-boxster-avic-d3-installation-instructions/
I think you actually need to attach the blue wire on your Avic harness to the amp turn on wire in your Boxster, but double check the instructions to be sure. You will need to register on Renntech to see the instructions.
Good luck
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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 12-way driver & 8-way passenger seats, Litronics, silver console
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