I found the buzzer connected through the P5 header is not working. So I guess it was because earlier I pulled the cable too hard while trying to disconnect and the bracket fell apart. I later locked it back but I guess the cables are misaligned.
The lesson learnt is NEVER pull by the cable. Instead, I should hold the bottom portion, near the socket side, when pull out or unplugging.
So I made a new cable. I read the package and wikied to learn that the connector is call IDC cable.
This time I made a 1.2m long cable, so that I can swap RPi or peripherals easily.
.END
http://en.wikipedia.org/wiki/Insulation_displacement_connector
http://reprap.org/wiki/MakeIDCCable
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