If the vehicle cannot return to run position after start or if the interior fan is not getting power, it may be the electrical portion of the ignition switch has become erratic or has failed. The entire switch assembly should be replaced.Google+
Car Problem Reports
Porsche Boxster S Electrical Portion of Ignition Switch May Become Erratic or Fail
Porsche Boxster S Problem
Average Mileage: 44,070 mi (28,000 mi - 65,000 mi)
Visitor, 2003 Porsche Boxster S, 39,500 mi
KEy would not return to off postion--replace ingintion switch
The key started to stick when returning to the off position and now stick and electrical items will not work. Looks like it need to be replaced.
Visitor, 2000 Porsche Boxster S, 47,850 mi
ignition key will not return to run position, is difficult ro remove and at times acts as if key is still inserted.