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GSY,
A few years ago the same symptoms started on my '07 Cayman S, sometimes no juice to the starter after turning the key but everything else was working ok.
The fact that it was an intermittent issue made it harder to diagnose, I installed a new switch and didn't cure the symptoms (even removed the starter and got it checked for it's proper operation)..
However, by pure coincidence we found the culprit... it ended being the Positive Cable that goes from the battery (through the firewall) to a some type of 'power distribution box' that is located inside the cabin behind the glove box.
The positive cable connects into this box via an unusual "friction connector" you will see what I mean after you remove the cable, on my car, I removed the cable, clean it properly and reinstall it with some dielectric grease, and the issue never showed up again.
However, it drove me nuts since the failure was intermittent..
Good luck!
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