Ignition will not start
 

Hi,
Last week I finally got around to buying myself a well taken care of Porsche Boxster 986 '97. The PPI and from testing it myself for about 1000km it seemed in very good condition. Now I do though have an issue staring the car, sometimes it starts right up, and other times it is just cranking for as long as I hold the key.

Here is a link to a video showing the situation
https://youtu.be/stCoNvBtcAg

Have seen other discussions about this which a lot of them landed on the crank sensor, though as my needle seems to be moving I can't see how its likely that that is the reason. Any ideas to what it could be?

PS after trying for about 5 minutes it usually works, and did so that time to.