I'll go for the switch. Boxster's ignition has 2 parts, electrical or selector switch and the mechanical assembly. Everytime you turn your ignition switch, both mechanical and electrical part moves together. So if the selector switch, which is made of hard plastic and probably copper plates and contacts, became worn out, this will sometimes crush to its others and prevent you to turn the ignition. This will also create a havoc on the multiple contacts circuitry. Like for example, your wiper will not work, headlight will not turn on, circulation fan not working, etc. The electrical part is not expensive. It is cost approximately $20.
After changing the electrical selector switch and you, still have the same problem, then mechanical part will be the culprit.
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